Help! Talk time can't be reset after charge

[wuad]

I wonder whether TP2 resets the counter after full charge. Everytime when I charge my phone, the standby time and device usage are reset in settings->Power->information. However, talk time remains untouched. So it seems that my phone stands by several minutes, but has talk time over several days since last full charge. Any one encounter this problem or has a solution?