The fact that switching off & on seems to solve this, would certainly point towards some sort of Thermal shutdown, but as you say, temps look fine.
Have you checked the motor?
I'd be inclined to strip and clean, make sure all is ok inside.
Check all connections, solder ones and mechanical, so Sensor Wire etc.
If you're happy with all those, then it's 'obviously' not those, but thats the easier solutions checked and sorted straight away.
What about Speedo Profiles? I had issues with mine some time ago. It was just too much and was shutting down, like you describe.
If happy with all that, how about trying a 'Power Cap' plugged into a spare RX port?
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