Hi, I've been using the phone for a while. However, the 5G network doesn't seem to connect. It does when you swap the sim card with a different one, and after 10min it goes to 4G+ for some reason, and it's stuck there until you swap the sim, and the loop keeps going. It never seems to stay 5G.

Yes the phone is in it latest update.

Yes the SIM can connect to 5G. (tested on other 5G devices)

Yes I have a 5G plan.

Yes I have tested this while literally standing under a 5G node.

Yes my service provider supports the 5G bands of the Xperia 1ii.

Yes I've tried multiple sims.

Yes I have contacted my service provider, and they say everything seems fine from their end of things.

Yes I have restarted, and factory reset my device multiple times.

Nothing seems to work too keep my 5G phone stay connected to 5G.