Is there a troubleshoot or Error Log explanation page

I have been getting various errors - System LOG. Frequently i get No Internet but signal metrix shows 5G signal normal…
Thank you in advance

share the error logs

When there is no internet but the AT+ commands says i have 4G or 5G signal from RM520 card - where are the error logs located…
TIA

Current Log

Sat Jun 17 20:14:27 2023 daemon.notice netifd: modem_2_1 (32732): [06-17_20:14:27:579] requestRegistrationState2 err = -19
Sat Jun 17 20:14:27 2023 daemon.notice netifd: modem_2_1 (32732): [06-17_20:14:27:579] QMIType 17 has no clientID
Sat Jun 17 20:14:43 2023 daemon.err odhcpd[3413]: Failed to send to ff02::1%guest@br-guest (Address not available)

What modem model do you have ? Did you try latest firmware update ?

RM520 on a sled
Slate AX on FW 4.2.1