Since new, mower drives erratic after ½ hour. Moving steering arms makes the wheels drive in 'pulsed' responses. Mower goes left & right. Impossible to mow around beds/straight line. Sitting for a day, it will run for a ½ hour then repeat. • What is wrong with the unit? • Have you seen this behavior before? • Is there a likely single point failure, such as a drive belt or idler/bearing that would cause the input shafts to be affected simultaneously? jerry-rogers@usa.net & craigostlund@gmail.com