iPhone14Pro model facing disconnection issues under excellent RF levels

Dear experts,

I have been observing a lot of specific iPhone14Pro model facing disconnection issues under excellent RF levels.

When we check the signalling its always showing this attach messages since it is disconnected from network.

Anyone have any idea why this is happening?

We tried enabling SPID-6 parameter to see if it will resolve it but no improvement was observed.

Why there are alot of attach messages on iPhone14 Pro model where the user complaints about signal dropping to NIL for 2sec?