@Marvin_S
Band 3 and Band 8 works fine on their own.
Band 8 gives slightly better speed.
Few days ago the router would switch between 8,3 and 3. and if it showed a stable 4G+ on the router then it would lose its IP.
A simple 4K stream on PS5 would cause no internet..
I had manually set the band to band 8 only, to be able to access the internet.
After selecting 3,8 today, its switching b/w 8,3 and 8.
I am still testing and for now its working ok with 3,8 - > 8
I will now test with Auto band switching.
[EDIT]
After switching to auto, the IP address is gone blank, still have primary and secondary DNS.
Network type is 4G+ LTE with Band 8,3 on the (Advanced -> Status) tab
All my devices shows (Connected, without internet)
4G+ logo is stable on the router.
Replying using my phone, not rebooting the router in case you need any logs or info
Enabling manual band selection is also not possible. Tether app says "Search failed. Please try again later."
Web Interface says
"Error code: 89534
No available band"
IPv4 tab shows blank IP address but Primary and Secondary DNS are there.
IPv6 has IP address but Primary and Secondary DNS are blank
Manual network shows
"Error code: 89533
No network searched!"
Ok, here's a wierd thing,
when on auto its switching b/w 3,8 -> 3
the weird thing is in manual mode band 8 is not there.