Orbi RBR40 Drops Connectivity

Hi JL.  Im not familiar with Net Uptime Monitor.  Does it monitor the internet connection at your router?  Or does it measure internet connectivity through the modem and router to one of your LAN devices (eg main computer)?  A dropped signal due to your router may not affect the signal received at your modem from your ISP.  Does your CM1000 have logs that are accessible to correlate with the Net Uptime Monitor output?  It’s hard to tell what might be going on from your listed timeouts but it could be the ISP is having issues.  A few seconds here and there makes me think its something on their end.  Does this situation continue over several hours? Does it correlate with any sort of weather condition?   Is this a new setup for you or has this equipment been in place and running well for a period of time?  Do your RBS20’s turn magenta in color and if so do they resync fairly quickly to your RBR40?  If the results you show are ongoing and consistent, you might try temporarily substituting another (older, cheaper, spare, etc) router for the RBR40 and see if that changes anything.  Your RBS20's would be useless during this test.

PS - There are new firmware updates for the RBS20 and the RBR40 you might try