@MR.S Yes - only problems with the ER605 routers Sure - will make a drawing later today - but for now: Internet === WAN - Box12 (ISP) - LAN === LAN - Omada switch - LAN === WAN - Omada routers - LAN...

@MR.S All ER605 routers are switched off (but still connected). Then only one is powered-on. For this customer, I have arranged remote powercycles All tests are done with this single router (combined...

@MR.S My guess its a different (real!) issue. And with the right problem description. I'm running a single ER605 now and still the same issue. On the WAN-side I'm using DNS-servers from Cloudflare....

@MR.S Thank you for sharing this experience - great! Does this problem happen if all routers are connected to the same switch via the LAN-side? Or does this also happen when they are all connected to...

@MR.S Tried with DNS cache enabled and disabled - no difference. All routers are on the prep/staging bench on the customer site. Each router is managed by the same controller - just with a different...

@MR.S Thank you for the suggestions. Tried the firmware upgrade released earlier today - no improvements The same for DoH proxy with Cloudflare or any of the others. Even a ping-test and tracert-test...