Do you have any fixed IP devices? Any IP reservations set up on your router?
Do you have iCloud Keychain syncing on?
Just poking around for a clue.
You could try Settings > General > Reset > Reset Network Settings as a troubleshooting step.
(oops nevermind)A perhaps related Wi-Fi issue: since last night, it seems I cannot log onto my Wi-Fi network with my iPhone (X), iOS 14.0.1. Initially, I thought it was an issue with my internet service, but my laptops connect to the network no problem (MacBook Pro 13" 2014 and MacBook Pro 16" 2019). I don't even see the Wi-Fi icon on my phone -- despite seeing a blue check next to my network name. I've tried the Settings > General > Reset > Reset Network Settings to no avail.
Has anyone else seen something similar? Likely will call Apple soon.
Oh you're using a VPN. That's one of those details that would have been helpful to know up front. Glad you figured it out though.Yes, I had auto join enabled. I tried disabling that before doing the reset.
Then late last night I realized I saw my VPN app (Lockdown) was toggling on and off like crazy. I completely disabled it, and everything is back to normal. Interesting.
Lockdown was good for squashing tracking by FB, Google, etc, but I suppose it worked a little too well with taking out the internet all together!
You could try Settings > General > Reset > Reset Network Settings as a troubleshooting step.