My 1st question for troubleshooting would be:
Does this issue over wifi occur at work or public hotspot? [If only at home then you've isolated the issue being home router and NOT the phone itself]
Do you use a VPN that auto enables upon WiFi connection like Samsung's VPN? [If so any VPN disable it and test]
You mentioned your router has 2x 5G networks .... what the hell? Is someone spoofing or man in the middle your SSID?! I've not seen a provider supplied router have 2x 5G SSIDs not even an extender.
1. Login to a laptop YOU own and directly wire to your router OR check your routers setup instructions and box it came with and take specific NOTE of its MAC address. Do NOT loose this!
2. Connect to your router and disable the 5G network. Alert ONLy family members that live with you of this action and to do the same!
3. Check if that 5G SSID name is still active. Verify it's disabled on your router and check the MAC address of that secondary 5G SSID. [I'm not using the word network to avoid mobile carrier network]
If that MAC address doesn't match therein is your culprit! You have a man in the middle pretending to be your network or an extender you're unaware of (but I doubt the extender would work in this test).
Rename your 5G network on your router and make it HIDDEN!
- look for a setting for MAC filtering:
Get all you family members phones, PCs, tablets and any smart Tvs and other smart appliances like light strips bulbs door cameras and locks, etc ALL their MAC addresses and add to the filtering allow list BEFORE enabling the new 5G WiFi hidden network and then turn it on!
Finally test all device connectivity. If no further issues & if after the renaming you see that old 5G SSID still showing up ... I'd now look into changing any account passwords.
BUT before panicking and doing all that check these settings on your phones WiFi sub menu in screenshot attached.
Does this issue over wifi occur at work or public hotspot? [If only at home then you've isolated the issue being home router and NOT the phone itself]
Do you use a VPN that auto enables upon WiFi connection like Samsung's VPN? [If so any VPN disable it and test]
You mentioned your router has 2x 5G networks .... what the hell? Is someone spoofing or man in the middle your SSID?! I've not seen a provider supplied router have 2x 5G SSIDs not even an extender.
1. Login to a laptop YOU own and directly wire to your router OR check your routers setup instructions and box it came with and take specific NOTE of its MAC address. Do NOT loose this!
2. Connect to your router and disable the 5G network. Alert ONLy family members that live with you of this action and to do the same!
3. Check if that 5G SSID name is still active. Verify it's disabled on your router and check the MAC address of that secondary 5G SSID. [I'm not using the word network to avoid mobile carrier network]
If that MAC address doesn't match therein is your culprit! You have a man in the middle pretending to be your network or an extender you're unaware of (but I doubt the extender would work in this test).
Rename your 5G network on your router and make it HIDDEN!
- look for a setting for MAC filtering:
Get all you family members phones, PCs, tablets and any smart Tvs and other smart appliances like light strips bulbs door cameras and locks, etc ALL their MAC addresses and add to the filtering allow list BEFORE enabling the new 5G WiFi hidden network and then turn it on!
Finally test all device connectivity. If no further issues & if after the renaming you see that old 5G SSID still showing up ... I'd now look into changing any account passwords.
BUT before panicking and doing all that check these settings on your phones WiFi sub menu in screenshot attached.
