BG600l-m3 doesn't search for network sometimes

Hello,
I use the BG600l-m3, it’s work well most of the time but sometimes after network activation it doesn’t search for network as +CEREG: 2,0 is emitted for 1 minute.

Same patterns of command are repeated, and about 1 of 20 is not searching. I need to reboot module and relaunch sequence to have a connection.

Did you already have this case? Can we launch the search manually?