Dryer was shutting off before time is up. Just turns off completely, timer does not continue to move. Worked ok in Air Fluff mode, just was a problem on heat modes. Sometimes I would have to wait a few minutes to restart and sometimes not.
I took apart back of unit and cleaned all lint and dust. Lots of hot air flow out of the exhaust. The fuses metered good. Since then it will run intermittently good, then stop in the middle of cycle again. May or may not have to wait for it to cool down before it will restart.
Not sure what I should try yet. Any help appreciated.

I had cleaned the lint chute. Ran the dryer with vent disconnected about 30 mins no problem. Did load for 60 mins - finished no problem. Next load on 60 mins ran 20 mins then quit - restarted and it finished. Next load on 60 mins ran 40 mins then quit - had to wait for it to cool down before I could restart and then it finished. Time between each load was at least 30 mins.