I have a 2012 Regent 22/44 with a 22hp Briggs Professional series twin. After mowing for 15-20 minutes the engine dies when I make sudden direction changes - fwd /rev or left / right turns. If I stop & wait the engine will usually chug back to life. Almost like the seat safety switch when I lean too far off the seat. This does not happen until I've been mowing for awhile and the engine is good and warm. Any ideas?