That's very bad and I'm sorry to hear that. Anyway, perhaps you have other options.
I also have a Android TV box and on the whole it is working fine with some annoying issues I have to live with.
I recently bought a Google Chromecast and found IU can substitute the Android TV box totally as I can stream (cast) Movies (as long as they are in mp4/264 H format) from my local NAS (localcast from Play Store), pictures, presentations (Polaris Office suite), screen cast of my phone/tablet (mirrorcast), music files (either on device or my NAS), use BBC iPlayer, Netflix and more and all in superb quality.
Maybe its worth looking into it for you? Less hassle and Chromecast is so cheap and just works out of the box. One word of caution, you need a pretty strong and reliable Wifi signal.