We have a WR21-002B-DE1-SH with Cellient MPL200 module. We have two SIMs (different ISPs)attached. Device is in a ship. When ship moves from one SIM area to another, the device does SIM failover ok, but on returning from SIM2 area to SIM1 area, it doesn't do the SIM failover because device thinks it's still connected with SIM2, even though it hasn't got connection or IP.
Only reboot fixes this, so after reboot, the device connects with correct SIM and APN.
Testing manually this, by forcing the change the device works ok. What can be the issue?