Got my AG tires on and what an unbelievable difference over turf tires with traction. But now I have big problems. Yesterday after mowing and some real hill climbing with the mower as I went to park it for awhile I noticed the steering wandering a bit (kind of unresponsive) but it's done that before so I wasn't concerned. After about 30 minutes I went to use it again and I have absolutely NO steering, none. How does this steering work and where do I start to try and diagnose this problem.