iPhone 16 Pro Max Wi-Fi Disconnection Issues

I have the same issue. I have to restart my phone to get it to connect to my xfinity router. And randomly I see 5g instead of the WiFi symbol and have to restart again. This just started a couple days ago.

After removing VPN, deleting VPN software and profile, did you reset network settings? That’s a required step.

If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support

Do you have a VPN installed on your iPhone? If yes, VPNs are completely unnecessary on iPhone and often cause Wifi connection issues. If you have a VPN, turn it off at a minimum, but better yet, completely remove the VPN provide on your iPhone.

I find that most things that filters OR hides your IP can cause Wi-Fi to drop. Though the biggest culprit for me has just been Apple's iCloud Relay (my Norton VPN with the private IP is on right now and no issues as long as iCloud Relay is off). So:

• Don't use Apple's iCloud Relay (this is Apple's own VPN in a sense that is usually on by default). Turn off Limit IP Address Tracking in each Wi-Fi's setting OR just globally turn off Private Relay in Settings. Why is this? Well at least for me, my Netgear routers consider iCloud Relay's constant pinging a DOS attack. And it appears worse in the new iPhones for some reason. Literally most of my entire routers' logs are iCloud Relay DOS attack blocked but only for this iPhone 16 (origination IP is Apple's servers, and pretty sure it's the iCloud Relay servers too, and destination IP is my iPhone 16, and ports being pinged are the iCloud Relay ports). None of my other iDevices do this or at least in the frequency that causes them to get blocked.
• Avoid certain VPNs (certain VPNs will work as long as Apple's iCloud Relay is off).
• Avoid certain Proxy networks (especially if they function like Apple's iCloud Relay, and again certain things will work if iCloud Relay is off).
• And in rare cases, if you have a Management Profile assigned to your device that masks your IP, it may cause issues too (sorry certain business phone users, and again certain things will work if iCloud Relay is off).

This at least is all that I've found in my one month of testing for the Wi-Fi's that I've been using. I can't guarantee it will work for everyone but I personally blame iCloud Relay in my experience for all the issues. Now Apple just need to work with ISPs and/or certain router manufacturers to not mark their iCloud Relay traffic as DOS attacks or just reduce the frequency of the pinging...

I have found a solution, at least it worked perfectly for me. Just go settings > Wifi > “your network name” > Wi-Fi 6E mode > off. Suddenly I was able to use my wifi without any issue. Hope it helps most of you !

I have vpn removed and still having this issue.