My call timer will only stay accurate while the screen is on, once it shuts off the call timer seems to stop counting. I can be on a 10 minute call, but once the screen shuts off after about 30 seconds on the call, the timer will read 30 seconds at the end of the call. However, if i adjust the volume while on a call, which turns the screen on, I can actually watch the call timer jump from 30 seconds to the accurate time for the call.

Anyone else experience this? Can anyone offer insight on this?