The symptoms sound like the DCT clutch for 1-3-5 is not disengaging just prior to the machine coming to a stop. The fact that it only occurs when ambient temps are 80°+ makes it more confusing to me.
If you have the opportunity when the 80° or better temp condition is met try shifting the gear selector into neutral as you slow to stop then back into H or L instead of stopping while in H or L. That, at least to me, would confirm it's a clutch, clutch solenoid, or computer program issue.
I think you're going to be forced to take it to a Honda Powersports dealer with a good, trained tech who understands the DCT.