ReSound Dot 10 hearing aid troubles

I have Dot 10 hearing aids. I am having trouble with the high end frequencies dropping out of the mix for a while and then cutting back in. I’ve had this happen on 2 other occasions over the 2 years since I got my hearing aids. Both times the hearing aids were simply replaced by the manufacturer.

So on average these hearing aids last several months before this problem reoccurs. However, my warranty is up in a few months.

I am very discouraged with these hearing aids…

Anyone have any idea what the problem might be?

Thanks!

Sweat?----