GadgetGuru: Just solved the problem! The trick was backing up the database. Seems obvious now.

13 hours ago · profile

Totally frustrated too — WiFi disconnections is infuriating. What worked for me was using a dedicated 2.4GHz network.

See also

• Issue: devices going offline in Home Assistant
• Best practices for securing a Z-Wave network?
• Frontend customization — where do I start?