Following or unfollowing hasnt made any difference and I double checked, that the channel is not in followers only mode. What I did notice though, is that sometimes my message gets through, which confuses me further.
I know that the following applies:
“If you send more than 20 commands or messages to the server within 30 seconds, you will be locked out for 30 minutes.”
When I ping my bot, it replies and if I ping it 3 seconds afterwards again, it doesnt.