BG95-M3 LAR02A03: Sleep mode / SMS reception delayed

I use a BG95-M3 LAR02A03.
Incoming SMS messages are delivered with a significant delay. Sometimes they arrive within seconds, sometimes it takes more than 10 minutes for the SMS to arrive.

I would like to find out why this is happening. Perhaps someone has the technical experience and would like to help me.

Thank you very much.

Could you please show me your AT log?