I got a Phonak Brio HAs at Costco a few months back. They worked great but every now and then, usually when I was in a room with other people, I heard a silent (but noticeable) beep in the right HA. It would beep only once every couple of minutes (it is not the low battery signal). I went back to Costco, and Phonak replaced them with new ones. Alas, I have the same issue. I speculate the HAs are affected by some electromagnetic signal, kind of randomly. I did not have this problem with my previous HAs (also Phonak Smart IV).
What do you think it may be and what can I do to avoid it? It can get sometimes disrupting.