We do not run the dryer except when someone is home.
I also don't run the dryer unless someone is home.
I know a great washer/dryer repair guy that comes and fixes everything. He told me he's found a lot of odd things in washers and dryers - socks, wallets, bolts, sticks, duck tape, etc. Get a good repair guy that can come check it out for a reasonable cost and make sure nothing else is jammed in it.