Drive handle stuck again. This time it could have been dangerous. While cutting up our hill, I slipped, let go of the mower and the blade stopped but the mower kept going since the drive handle was stuck to the side of the main handle. I was able to catch up to it before it went down the driveway and into the road. Any suggestions? (Perhaps a slightly less or more of a curve in the design of the drive handle might eliminate the problem of it sticking.) This could become a safety issue.