I have an Amazon fire tv that's three years old is having issues with the remote not working on the TV as it will randomly freeze up and quit working. The remote was reset and the only way the both work tv and remote that is. Is we have to unplug it. Batteries are good on the remote as well. Any clue what we can do to get it fully functional again? We hooked up a Roku right now so we're getting by in the meantime.