Apps randomly shut off

[Mackey]

I bought a new 77 inch OLED tv a year ago. Ever since then it has randomly reset itself when using apps, (Youtube, Sirius, Netflix, doesn't matter). Basically the tv freezes, closes out the app and goes black as if the power has been cut, and then restarts to HDMI 1 just as it does whenever the TV is first turned on. I have had a technician visit 4 times already and he's replaced the main board, the wifi board, the remote control and the remote sensor. Basically he's replaced everything except the display and the power cord. Of course we've made sure the firmware is up to date and done many hard resets and nothing works.  I'll add one more thing that happened last week for the first time, but it happened twice so it is definitely not a coincidence. I was watching a movie on Disney Plus and a half second before my phone rang, the movie stopped like before, but this time the app restarted in stead of the entire tv restarting. This exact same thing happened 15 minutes later, a half second before another call came in so it was not a coincidence. My phone is android with Verizon fwiw, but of course I get calls all of the time and this only happened this one day. Since almost everything has been replaced I had already been thinking that some kind of electromagnetic interference may be at issue, but this is not my specialty. Has anyone else experienced this?