Just got my daughter's '01 Forester back from the mechanic the other day
after replacing an O2 sensor (thank god it wasn't the Catalytic converter).

She drove it around for a day and took it to a party last night. On the way
home she was driving down the road the runs past our street when the
Forester just died. The motor stopped and all the dash lights went off
except for the radio, which was still playing through her iPod. She thinks
the headlights were off as well, but she can't recall for sure.

She coasted to the shoulder and put it in park and turned off the
headlights.. She tried starting it and it didn't do anything the first time.
The starter didn't spin and there were no dash lights.

She tried it again and it started right up. She drove it home and it seemed
fine. It started OK this morning but I was worried about having her drive
back to school with it.

We gave her our spare car and I checked hers over. I couldn't find anything
loose or burned. No relays or fuses bad that I could see. Battery terminals
tight. I decided to take it back to the mechanic after work today and have
him check it out tomorrow.

What could have caused that?

TIA
Jon