You know what, I think you are right, it is almost certainly a DNS. I have Adguard setup at home, so I route all my DNA requests through wireguard even though I’m using a split tunnel. That would explain why everything dies, even traffic that shouldn’t be going through the tunnel.
I’ll keep pulling on that thread, thanks for the insight.
It might be OPNSense, but the problem occurs when I leave my house. My network connectivity dies when it switches from wifi to mobile data, only to recover when I disable then re-enable wireguard. This indicates to me that the android client is not properly updating routes or DNS settings during the network change, or lineage OS is doing something wonky, but I could be wrong.
I had it set up pretty well with OPNSense as the wireguard gateway into my home and the official wireguard client on my lineage phone and it was working great for a year but something changed recently where it’s become really unreliable. The problem is not OPNSense, but my phone. Not sure if it’s the client or lineageos causing problems.
I’ve been using LineageOS+MicroG with very little google software (only maps) and it’s been working great. Any reason I should switch to Graphene? I noticed the main dev seemed to have some disputes and interesting personality characteristics, so I was a bit hesitant to adopt. I also had an irrational “I wouldn’t be surprised if 3 letter agencies are involved” vibe about Graphene, but nothing concrete.