I setup tor relay on Windows 10 see https://metrics.torproject.org/rs.html#details/AD5B534F1CF8ABD17001817CC2ACF6D11345766F as windows service.

At service start it use about 15% CPU.
Then when it works correct it can use from 0 to 5 % CPU.

But some times tor service start to use 100% CPU for a long time (10 and more minutes). So I restart tor service. It can happened 2 or times per day.

And at this time it does not send or receive anythings by network and it does not read or write anything to disk. Network and disk usage are 0%.

Why tor service utilize 100% CPU? Is it bug on Windows or I have configuration errors?