Hi Toma,
I’ve worn CIC hearing aids for years. I do have a little trouble with them sometimes making a slight popping noise when I eat, but they really shouldn’t shift when you talk or move too much when you chew. It sounds like they might be too loose in your ears. I would agree with the poster who suggested getting new shells made if they’re slipping that much. Do they both seem to shift, or does one seem to fit differently than the other?
As far as the phone calls go, see if your audiologist can make adjustments for that. There’s a lot they can do with programming to help call quality. I am currently using a Widex Diva, which delivers phenomenal call quality with hardly any feedback. I trialed a Widex Mind440, which was terrible on the phone, though adjustments did help a lot. But since I use the phone a lot for work, I returned that aid.
You might even find that better-fitting shells will also improve your call quality. If the shells are too loose, it can cause sound to leak up around the hearing aid and into the phone receiver, which can muddy the clarity and audibility of the caller’s voice.
It takes a lot of patience, practice and sometimes a lot of visits to the audiologist to get your hearing aids to the point where you can love them instead of being frustrated by them. They’re all different, and none of them is perfect in every single situation. But the right ones should work well enough to greatly improve your life and not cause you significant problems in other areas – like comfort or quality of life and ability to work.