I received my machine on Wed of last week, and it has worked well since I got it until last night. While cutting a pattern last night, the cut motor rpms started to fluctuate. Before I was able to get to the machine, the motor stopped but the machine kept going like nothing had happened. I stopped the operation, shut the machine off, and removed the flexshaft from the truck head. I removed the flexshaft core lubricated it, removed the rpm sensor and checked the magnet, replaced everything, started a new pattern, at load bit prompt, the motor won't turn, but it starts moving like it is.. Can anyone help me here...