Matter over thread - almost all Devices suddenly offline

Hello community,

today all my matter devices went offline. I restarted all add ons and devices, restarted Home Assistant (green). Nothing helps. The interesting part is, that two devices went online again after a while and are working fine now.

I really do not get the problem and appreciate all suggestions.

Thank you in advance!

After i unplugged my Internet Router for several minutes and then restarted it everything works normal again… hope it stays that way.