Is my heated steering wheel working correctly?

[Crash513]

This question is directed at anyone who has a heated wheel on their E70. Now that I' m taking some extended trips in cold climates, I'm finally starting to use my heated wheel on longer dives. What I have noticed is that the wheel heats up quickly, and stays quite warm for some several minutes. However, after a while, the wheel seems to radiate heat at a much lower temperature. You might say it starts off almost hot, then drops down to mildly warm. If I shit it off for a few minutes, then turn it back on, the cycle repeats.

What I' m wondering is whether this is the way the heated wheel is designed to function, or if maybe mine is actually malfunctioning. Any knowledgeable insights would be much appreciated.