I just purchased a Honda HRX-HXA a few months ago. It works great, even
mulching on tough weeds. It keeps cutting where my previous HRC-215 would
bog down.

However I ran into a small problem. When I pull it in reverse the wheels
are supposed to spin freely. Lately the wheels have been sticking while in
reverse. So it's real difficult to maneuver. It is intermittent.
Sometimes if I make it drive forward, the wheels will un-stick next time I
pull it backwards.

Is there something wrong with the transmission? I am hoping I don't have to
take it in for warranty because I would probably have to leave it at the
shop for a while.