Just bought this machine , it runs fine but after about 15-20 minutes the trans just stops working, no warning , but you can shut off the engine and crank it right back up and it works fine for a little while then it happens again. It's very annoying and every now and the the display shows oil pressure circuit open check it. I have changed the oil pressure sensor and checked the pressure with a gauge and it's got 65 psi idling. But every now and then the message pops back up. Any help would be appreciated. Thanks