MrPbody , It's like the GV makes the oil dirty after about 2000 miles and this causes the GV to not have enough oil.
When I stopped and let the oil cool for about 1 hour it didn't work.
Drove for about 500 miles more and then it worked again for some days.
After changing oil and cleaning filter the issue was gone for 3 moths till winter and first 5 months of next year.
Then again the GV turned off every now and then.
And stopped again after 400 miles.

Sport440 , The GV is 2 years old and besides "stock" set-up like in manual the only difference is the momentary switch on the Cheetah which is connected like the supplied footswitch.

Not really clear in my head if it's not the wear of GV , like the tech line said , why the issue is gone for 1 year if you change the oil and clean filter.