If your Amazon Fire TV is laggy or freezing, it may be time to perform a reset. A reset will clear all memory and usually solves any problems you are experiencing with the device. You can reset the Amazon Firestick, Toshiba, Insignia, and Fire TV box models using these steps.
Fix 1 – Force Reset from Remote
To reset Fire TV from the remote:
Press and hold the “Select” and “Play” buttons on the remote simultaneously until the Fire TV resets. The screen should go black, then show the Fire TV logo. These steps reboot the Fire TV and will not clear any data from the device.
Fix 2 – Remove Power
It’s safe to simply pull the power cord from the back of the Fire TV, then wait about 10 seconds before plugging it back in. This should fully reboot the device allowing you to continue using it.
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FAQ
My Fire TV still keeps freezing. What can I do?
If the freezing seems to happen only when using certain channels or apps, you may want to try uninstalling then reinstalling the problematic channel or app.
If your Fire TV is freezing constantly, you may want to try a factory reset. A factory reset will clear all data and settings from the Fire TV. It’s extreme, but it may be the only thing that allows you to use your Fire TV again. A factory hard reset will wipe all data and settings from the device and set it back to how it was when you first purchased it. You can do this by going to “Settings” > “My Fire TV“, “Device & Software” or “System” >” Reset to Factory Defaults“. From there, enter your PIN, then choose “Reset“.
If you can’t access the menus to factory reset, you can press and hold “Right” ◑ on the directional pad and “Back” 
together for 15 seconds, or until you see a message appear that says, “Reset to Factory Defaults“.
Once the message appears, press “Left” on the directional pad and select “OK“, or just let the time tick and the system will automatically reset.
Hopefully, the Fire TV will restart and allow you to go through the setup process to get it working again.
Is there a way to factory reset Fire TV without the remote control?
Your best option would be to use the remote control feature in the Amazon Fire TV app. The app is free and available for download to your Kindle Fire, Apple, or Android device. You can also plug a keyboard into the USB port to navigate. I go into more detail about this in my post here.
I did a hard reset. My fire TV is frozen at the select language option. I have tried unplugging TV and pushing select and play alternately. TV still frozen. What else can be done.
Mine is frozen on new vision accessibility feature
Does the step to factory reset from the remote work for you? If not, try starting your Fire TV in Safe Mode – https://streamersworld.com/fire-tv-firestick-how-to-start-in-safe-mode/
I followed your instructions on how to unfreeze my remote and I really appreciate it thank you so much..
on my television I had an older fire stick and then purchased a new fire stick In both cases it will freeze and buzz at any time I have done a hard reset and I have also return to factory default edit apps on again and again it is still doing it is it my TV is it an outlet please help
Try a wall outlet. Sometimes the TV won’t provide enough power via its USB port.
Thank you Mitch but i have already set up that way. im so frustrated
I don’t want to go out and buy another TV and that not be the problem either
Also all the hard reatsrts and resets are not fixing it
If it’s a fire tv, try plugging in a controller through the usb port. My ps4 controller worked perfectly
You are a genius. Haven’t been able to scroll right then the picture became Hugh. The reset fixed it all! Thank you, thank you, thank you!!
Did factory reset and now stuck on update. Says cannot update your tv and try unplugging which we have already done several times.