Regardless of why - this is far too annoying to not rule out the basics.
Ask your audiologist for a loaner pair of hearing aids of the same kind and test them for a few days. Does the problem continue? If not, you can either ask the audiologist to reinstall your software profile from back up and see if that fixes it, or send them back as defective.
There is a reason that after a few attempts at troubleshooting your cable company will suggest a new modem. We don’t know if it’s the modem, but it’s cheaper, in both frustration and work-hours, to rule it out with a hardware swap.
edit:
there is also a premise in tech where you always, always, always rule out Layer 1. Layer 1 is hardware. Is it plugged in. Does it have power. If your hardware is bad there is no amount of time spent fiddling in settings that will save you.
You’re ignoring this member’s posts.