I experienced this problem not too long ago. I had the Nadia (which is also like ultra powered HAs) and it was brand new at the time, we had to replace my ancient hearing aids that i had since 3. And i was wearing it in winter drumline. In winter drumline we play indoors instead of outdoors. And my right ear was hard of hearing at the time, and I guess since the first few weeks of wearing my new hearing aid in the winter, my right ear started going bad. My audiologist didn't know whether it was my autoimmune hearing loss causing it again or was it because loud exposed noise? We bought special earplugs for me (even though i was deaf) to protect my remaining hearing i had left in my right ear, it failed. and I wound up getting another implant on my right ear, implanted in september, activated in october (2010)