Treadmill stops during use?

I have a proform 795sl and it stops after about 45 minutes on a gentle walking pace with no elevation - i have adjusted belt and lube is ok but cannot resolve the issue - appears to be belt motor heat related as it goes again a few hours later - power still remains to the console lights when it stops, just the belt stops so the circuit breaker doesnt trip only i do when it stops - i have followed all faqs and belt adjustments and lubes etc and have been unable to resolve the issue --aussie who needs help please if anyone had similar issue and knows the fix -- sorry posted this a couple of times due to spelling error