No access to Github from my IP

Everything was fine this morning, now I can no longer visit Github.com. It’s like Github won’t respond to my IP. The response ERR_CONNECTION_TIMED_OUT follows from my home IP. Sometimes also ERR_NETWORK_CHANGED :thinking:
If I switch to the hotspot, via my mobile IP, everything works.
I deleted cookies and cleared the cache. There is also no proxy or other special circumstances. It is a completely normal DSL line. The problem does not occur on any other website either. Only on Github since noon today.

Is Github blocking in such a strange way?