Check the thermal fuse and thermostats again to eliminate them as suspects. Both should be zero ohms at room temperature. If you eyed the entire duct system from lint filter to outside of the house for lint, then these are probably OK.
One thing that will shut down a dryer: a defective door switch. If you turn the timer on with the door shut and can hear or see it progressing (running) then the door switch is OK.
If your door switch is operating marginally, the heat can expand the body of the switch and open the circuit (and shut the dryer off until it cools). Check the switch with an ohmmeter with the dryer disconnected from power.
A loose spade terminal on this switch (or anywhere else) can do this too.
Also, a misaligned door or defective door clasp might do this after heating up.
Keep thinking 'heat expands' and you might find it.
The only other thing left is a defective timer.
Good luck from Detroit, MI.
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