Thanks to the replies and advice above, I think my problem is with bluetooth, not the TV. My problem occurs while I am streaming the TV into my hearing aids and with that on, I go into the kitchen, next room to the living room, and while the microwave is running it causes the TV stream to fade in and out.
My concern is not the interference itself, which is always a few minutes at most, but whether this interference is damaging to my hearing aids. My guess is that it is not because the interference is not with the devices but with the microwaves waves that are interfering with the TV streaming waves. I hope that a physicist would reassure my assumption and I can keep using the microwave while streaming TV into my hearing aids.
Thanks for your help.