After riding 30 minutes today in 95 degree heat I had to stop on a 40 degree grass slope pointed uphill. When it came time to take off about two minutes later it was in H range, Turf mode. Gave it the gas and got a severe shudder with no rpm spike. Rode for another 45 minutes using MT and AT modes on normal trails with no further shudder. Maybe this is acceptable and I don't plan to panic unless it starts recurring. It does give you pause the first time it happens.