Iv just been out for a ride and its been fine, the only difference between now and earlier is it was really damp earlier as it'd just rained. I'm not sure if its water getting in the motor and playing havoc with the temp sensor but it shouldn't do as its covered in high temp silicone. It only seems to happen when I tear around on it, I'm not sure what the temperature limit is for the controller ?, as I have the temp limit for the motor set to 220F, but there doesn't appear to be a setting for the controller so I'm not sure what the shutdown temp is for it ?. If it carries on I think I'm going to fit some old slot CPU fans to the side of it to see if that helps with the heat transfer.