Ive got a bobcat T190 skid steer that will operate about 45 seconds and then the tracks will lock and immobilize the machine. Bucket still functions. I can switch it off and it will reset only to run another 45 seconds. Oil level is good. We had two hydraulic pressure switches replaced by Bobcat. . I've located the parking brake solenoid and checked the wires and connector. They are good…. Any ideas?