RBK50 no longer reliably connects to Google services

I've been running an RBK50 (1 RBR50 and 1 RBS50) with almost no issues for over 5 years.

Lately, however, I've noticed that certain devices (typically our iPhones or my iPad) connected to the mesh but will lose access to certain Google services, like Maps, YouTube Music, or search itself. The outage might last a few minutes or more. It seems to be an issue more likely to impact devices connected to the satellite (RBS50), but can affect devices connected to the RBR50 as well.

I have a PC hardwired to my Verizon Router, and it has no connectivity issues with Google, so I'm confident the issue is somehow related to the Orbi, but I can't seem to solve it thus far.

Here are things I've tried:

- I have rebooted both units (multiple times) and forced them to re-sync periodically

- I have made sure all firmware is current

- I have also rebooted the Verizon model (out of an abundance of caution)

The only wifi devices I've added to our home recently (maybe October?) were 2 Google Nest cameras, and a Dell laptop I rarely turn on. The issue with my Orbi feels more recent than those devices, but I'm not ruling anything out.

One last thing: Before I got the Orbi 5+ years ago, I had a Linksys router that had the same issue - intermittent loss of connectivity to Google services - but the Netgear extender I had at the same time never had this issue. As a result of this situation, when I went to a mesh, I chose Orbi because my Netgear extender had been so much more reliable. But 5+ years later, here I am again. It's truly bizarre.

ANY advice or ideas are appreciated. Thank you.