First off, I know the temperature was a little bit too high. I realised it had gone up to 39.5 C when the water I used to heat the bath suddenly went boiling hot as my housemate turned up the wrong dial on our boiler while the tap was running as the temperature had fell to 36.9, and only noticed too late!
This is a significant temperature increase. I would speculate that it is the cause of your problems.