@tom.hilgerink Version 1.5.3 should fix the issue. But you apparently can't just install it through the app. I installed mine manually using the web interface with these instructions...

I installed version 1.5.3 for my model/version/country manually using the web management interface. This solved my issue! The Shelly is working stable now for.

@TP-Link Thank you for responding! I'm not on the 1.5.3 firmware update, but on 1.5.1. I don't get a message to update. How should I proceed to install the new version? I also tried the guest network...

I'm having the same issues. The Shelly won't connect to the DECO M5, and if it does it feels highly unstable. I already tried disabling 5Ghz and Mesh without much result. Can we have any answer from...