So yeah, my wives 8310 battery reports between 50-100% charge, and if she is in a call, bam it shuts off, and will only turn back on, on charger. I would think it was battery BUT; this happened every day while in California, we went to South Carolina for the holidays (whole month of december), and it happened only once...
OS is up to date, I upgraded to latest to make sure that wasn't the issue, happened following day (in Cali)...and battery is 2 y/o...
Anyone ever hear of this anomaly?
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I vote for the battery, especially since it is 2 yrs old. You say the problem never occurs while it is on the charger. A cell in the battery could be bad and the battery will still show a decent charge, but as soon as a current load is placed on the battery, the battery can't supply the needed current to the phone, so it resets or shuts down.
Try a new battery. Same thing happened to my Curve 8320. Kept making static then turns off. Took me 2 batteries but finally fixed . Try to spin the old battery. If it can spin well then it is possibly warped Good luck.