Roksan 20plus motor issue

The motor is will run for 10 - 20 minutes & then stop. I have to turn off the speed control & then on again & it will run for around the same duration. Any ideas as to why this is happening...?

The head engineer at Roksan isn't available until Monday so in the meantime I thought I would ask you guys...

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Plug your TT into an outlet directly and see if the problem still happens
I'll try it thanks.

It's currently plugged into my Nordost Thor...
Tried it & still the same.
I can't figure out what is happening...