When we turn on the dryer, it stops after a few minutes. Sometimes I push start and it doesn't turn on at all. Sometimes it turns on and stops after five minutes. Sometimes fifteen minutes so there is no consistency but the heat is fine.

When it does turn off the timer points to zero. I will set it for 60 minutes and sometimes after 5 minutes it points to zero and shuts off.

Any suggestions what this might be and how to fix it?

Sound like a bad timer.

Where can I find a new timer? About how much do they cost? And are they easy to replace? Model # is GEQ9858JQ0. Thanks!

They are easy to replace. You can find at your local appliance parts house or look at Appliance Parts from RepairClinic.com - HomePage Hope this info helps. Good Luck