Buffering RARELY has anything to with your device or Nitro TV. Some of the others have intermittent buffering. Recently deceased Vaders a prime example. Nitro owner spends to the limit to make their system run as smooth as possible. With that said a higher end Android box or a 4K firestick will give you a much better experience than the older firesticks most have since before the 4K sticks came out the end of last year. Again, I've seen a few benchmark tests claiming the 4K sticks ranked 4th behind the Nvidia Shield and a couple of other Octocore Android boxes. If you're on the fence and just flat out don't want to use a firestick. Getting an Octocore box I've been told really cuts down on any buffering. I have a Shield and would use it much more often if it wasn't for the damn remote that comes with it. The same issue I have with the Android boxes. Their remotes all suck as Amazon makes the best remote in the business. Flat out. You want to use something comfortable in your hand as its what you will be using most of the time you are surfing or watching. A lot of buffering is just plain unavoidable. Even cable TVs that are hardwired get buffering from time to time. Heres some examples I've learned over the years that cause buffering or a less than stellar performance. Our NItro owner explains to us how when channels get overloaded, he has to do what he calls " load balancing". We may get buffering early in an event but then have clear sailing the rest of the fight or game after he balances the channels. Even HBO experienced this in episode 1 of this last season of the Game of Thrones. People thought it was their IPTV providers fault. It wasn't.
If you're renting a Modem/Router from your ISP and do not have their higher end fiber optic service, go buy yourself a new one. Most will give you a refurbished combo unit and they are all junk. My nephew works for a local ISP company and did installs before going into sales. Those old ones cause 75% of all their service calls. Do your homework or send me a PM here as there are a lot of factors involved in picking one RIGHT for your setup. I've been thru at least 5 tying to figure this out personally. The new Mesh routers are what you want as they will cover all the dead spots in your home. Buy separate units [Modem/router]. But they ain't cheap. For the same obvious reason you don't want a firestick built into your tv, if one malfunctions, you need to replace everything.
Where you place your router is important. You don't want your router in the basement in a closet cause your wife thinks it looks gaudy in your home. The least obstructive path your signal takes, the better. They don't go thru walls well, concrete, drywall, wooden, metal...it will need to going around to reach your tv.
Router placement. Having your router sit too close to your device or tv can be just as bad as your router being placed too far away in another room or floor of the house. If your router is, for instance, positioned right next to, or under your tv, move it if you can 5-10 feet away is what I tell all my customers. And get it up high if you're using other devices in another room. That signal will travel better up there than on the ground.
Download the Speedtest.net app on your phone and stand right next to your tv and run a test. Do that in multiple locations of your home so you know what area gets a decent signal and what doesn't. A decent way to test the speed your paying for as opposed to what you are actually getting. Also, keep in mind, you are only going to get a reading for about 75% of what your paying for while testing thru wifi. So if you pay for 100 MPS and your speedtest result shows around 75 speed. That's about right and you're getting what you're paying for more than likely. If you call and complain, just know that they will have you test your speed hard wired on your PC with everything else unplugged. In other words, they will have you disconnect your router completely and run an ethernet cord from your Modem directly into the back of your desktop or laptop.
Buy a wifi adapter so you can hardwire your firestick instead of depending on a weaker signal from Wifi. They are $15 on Amazon. You may need to buy a longer ethernet cord, but this is prolly thee best thing you can do. Plug it into one of the 4 ethernet ports on the back of your router and the other end into your wifi adapter connected to your stick or if you have an Android box most come with an ethernet port in the back of the unit.
https://www.amazon.com/gp/product/B074TC662N/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
Make sure your internet speed is up. I tell my customers no lower than 50 MPS and that's if you have no gamers in the house. And keep in mind LIVE TV takes more speed than apps like Netflix, Hulu or any movie app you may have downloaded onto your device. Nitro claims you need between 15-25 MPS to run and 45 MPS for 4K content. EVERYTHING in your house connected to your wifi is drawing off your service. The more connected wether running and in use or not, are taking from your streaming. 100 mps is the norm these days. the difference in price between 50 or lower and 1000 MPS [1 gigspeed] is normally no more than $20-40 more a month. If you've canceled your cable because you now know you don't need it any longer with a good IPTV service, take some of that savings and bump up your speed and/or go get yourself a new router. Mesh preferably.
Make sure you're plugged into your wall outlet instead of a power strip. You may think it's not a big deal but I've seen the difference myself on numerous occasions. Also, make sure you're using the power cord and plug that came with your device.
Unplug your router and modem once or twice a month. It's no different than restarting your PC. Everything runs faster and better. I make sure I do mine before any big fight or event coming on tv. Unplug them both if you have separate units. Then plug in your modem and wait till all the light come back on that were showing before you unplugged it. THen plug your router back in and wait till that one fully comes back up.
Then there's still things like where your house sits on your block. If you're on the end of your street, if your isp doesn't have a booster on that cable up at the pole, your service is not going to be as strong as the guy who got his at the pole in his backyard. Had a guy tell me the other day he passed on buying a house in a neighborhood because it was at the end of the block. [Now that's a guy who takes his streaming pretty seriously. You don't have to be that guy] lol.
Sometimes it's just a matter of adjusting a setting in your app too.
I can give you examples of prolly 5 or more other things that factor into why your getting buffering or just not experiencing what you should be experiencing.
95% of the issue you may have because you canceled your cable is on your end and in your setup. Get your hardware and setup correct and watch your other streaming issues go away. I personally rarely get buffering, but again, it's unavoidable on occasion. That's why you're paying so little for so much.
If you're new to streaming and go into it with the right attitude, you're going to enjoy the hell out of this, if you're expecting flawless tv as your cable gave you, you're more than likely not cut out for using an IPTV service anyways. Companies like NetFlix, Hulu, SlingTV, YouTube tv or Playstation Vue you will have fewer headaches but you're also paying much more and getting a lot less. You will get out of it, what you put into it. The more you learn, the better your streaming experience will be. And I know I'm explaining things a lot of you will never run across. I just like to inform and keep my customers up to date as to what you are or may be getting yourself into. Based on what Raiders has explained in his NItro experience, it sounds like very little. He may be a single guy for all I know and has a one device setup. Once you get into installing movie apps and keeping the wife and kids happy, things can get more complicated.