Has anybody experienced problems with the call logging on a Nokia 6126?

I stepped out of the house for a little while today and when I came back, my mother says I missed a cell phone call. So I checked the call logs and found nothing. I also checked to see if I had any alarm clocks set. I didn't. The time stored in the alarm clock is hours different from when the phone apparently rang.

My mom's hearing is fine. With the ringtone as such, it would be hard to confuse it for something else.

Any ideas?