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I too am experiencing a similar issue, although with the 5ghz wifi only. I recently had to change my modem (Archer VR1600v) because wifi stopped working altogether. I purchased a TPlink VX220-G2 from TPG. Ever since wifi has been dropping every few days. I’ve turned off band steering to seperate the networks. I can see 5ghz, however not giving out IP address. Switch to 2.4ghz network, all fine. What I’ve found if I change a setting on the 5ghz and save, 5ghz access is restored. I’ve had to do this every few days since I received the modem about three weeks ago.
I have the exact same issue everyone else is experiencing. My Archer 1600 was fine.
I have to change a 5ghz setting like band to get internet working on 5ghz again. The SSID is connectable but no internet. Signal strength is fine and I'm next to the router.
I called TPG to report this as it is a brand new router that you made me go onto a 6 month contract and pay $10 for but I am going to have to go back to the Archer until I purchase myself a router that works properly.
The agent on the phone said they didn't know about this and would escalate. I advised this has been happening for years to other people. Same exact issue and they were forced to go back to old archer or new router.
I have collated all the posts i could find and the issue has been happening since at least 2022: