Originally Posted by Ironhedz
I have seen this more on 7100 than on 7200, 7400. I had a client that had a 7100 where this issue would seem to happen once every two months or so. I ended up replacing the battery on the mp10a and have not had the issue since. Not saying that is the complete fix, but it seems to have helped in my case. Haven't had this issue resurface with the client since the battery was changed, about 6 months ago. The hardest part is soldering the tiny, tiny, battery on the mp10a. The only place I could find the batteries was aliexpress. Below is the link - good luck.
https://www.aliexpress.com/item/32956026111.html?spm=a2g0o.order_list.0.0.21ef18025toPoF

Did this issue come back for you since replacing the tiny battery? One of the systems I had would go along time before the issue came back, sometimes a year or just under a year. Don't have that issue anymore... replaced it with Cloud PBX!