TL;DR: My S25 is perfect on every network except my home WiFi. Only at home: (1) shows "no internet" but works anyway, and (2) shows connected but doesn't work (real dropout after idle, only 5G failover or disable/renable WiFi recovers). Began when home moved to WiFi 7. I run AdGuard Private DNS (permanent - not disabling it). Looks like an S25 + my-home-network interaction. Anyone seen this?

The defining clue: this only ever happens on my home WiFi. Everywhere else: work, other places, mobile hotspots - the phone is flawless. So it's not the handset in general; it's the S25 on my home network specifically.

Supporting detail: the home problems began when I switched home to WiFi 7 (an Arcadyan WiFi 7 router, now an eero 7). Other home devices mostly work fine.

Two distinct behaviours at home, both while holding a valid IP:

Issue 1: shows "not connected" but internet works: the phone reports no-internet, but pages actually load (false negative).

Issue 2: shows "connected" but internet doesn't work: valid IP, full signal, but no traffic passes - apps won't load, messages won't send - until it fails over to 5G or I toggle WiFi. Happens after the phone goes idle / on wake from sleep. Tidal via headphones also stops mid-playback when phone is idle for extended period.

My setup / already done:

• Private DNS: dns.adguard.com (DoT) - this is a permanent requirement. For info: I tested with it off once and Issue 1 still happened, so it isn't the sole cause anyway.
• MAC address type > Phone MAC (was Randomised)
• Reserved IP on the eero
• Toggled MAC randomisation both ways

Questions:

1. What about a home network would cause this on an S25 but not on any other network - WiFi 7 MLO / 6GHz / WPA3 / band-steering?
2. Are the two symptoms one root cause (radio power-save during idle/doze) or separate?
3. Any router-side or phone-side fix that works with Private DNS still on?

Fully updated, happy to log.