I had a couple of problems with mine since I purchased it. When I first bought it the brakes were all out of adjustment.
The sensor in the left hand switch gave out but was fixed.
My speedometer went crazy on me and finally just froze up. Fixed. For the first 4K miles it was in the shop about 4 or 5 times besides regular maintenance. It was very frustrating but seems to have all the bugs worked out of it now. (Knock on wood). I have been riding the heck out of it this year. I am using it for physical therapy on my back and spine and legs. I have 10K plus now and the last 4900 or so miles have been trouble free. Sometimes it just takes a while to get all the bugs worked out .
I know we do not buy new bikes with this in mind but sometimes it happens. Hope things improve soon.