Hi @Tib_, welcome to the Sonos Community!
I’m sorry to hear that you’re having issues with your Sonos system. What your describing sounds indicative of wireless interference, so I’d recommend following the steps listed in our support article for reducing wireless interference.
If that article doesn’t help, or you’ve tried this already, then I’d suggest contacting our support team for further support. They have the necessary tools available to help troubleshoot and resolve this issue with you.
I hope this helps!
