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I just received my microheat cap. I have not used it yet, but I could let you know sunday if it stays hot.
I'm not sure, but I believe there is an element internally that will not allow the cap to remain hot beyond 30 mins (whatever the setting) because people have fallen asleep and injured themselves.
Therefore, most manufacturers 'attempt' to determine what is the maximum exposure before damage occurs and the device starts the cooling process.
I've had/had two caps, different vendors, and they've both cooled at a point. I just crank up to high for 30 secs, and then back down to medium and that restarts the medium heating setting.
I don't know if this is your case, but this was my experience.
This was the one I recently purchased and after 30-40 (not sure which) mins it's not as warm as it was after 5 mins. Once I reset (turn to high then back down to med) it returns to the medium heat setting.
I have the Gold n' Hot cap too. I've had it for 6-7 years. It gets hot and stays hot for as long as it is plugged in.