My Honda Harmony 2013 works perfectly, EXCEPT that 2-3 times per year, it throws it's drive belt and no longer will move ahead or backward in any of it's 5 gears. My repair person has tried putting on new belts, adding a little extra guide to prevent the belt from coming out of it's drive pullies but nothing helps. Has anyone else seen this repeated failure? And most importantly, has any one found the fix that will keep the drive belt in place?