my o4 polaris 4x4 lost power just going down road at 10 miles an hour . Had only been on it for 20 minutes. Engine still ran just no power. Shifted into reverse had little power. Shifted back in forward and it ran for about 5 minutes then no power again. Was afraid to drive it any further so towed it back to cabin while still running.. It had power once again for a few mintues. No smell of anything burning . Several years ago I had to replace belt becasue it did something similiar. Could it be the belt again?