Hello Quectel Support Team and Community,
We are experiencing a persistent issue with our EC25-EUXGR and EC25-AFXGA modems where they disconnect from the network after a random period and then fail to reconnect. We are looking for assistance in diagnosing whether this is a firmware, hardware, or network issue.
Problem Description
The device connects successfully and operates normally for a variable duration (hours or days). Then, the cellular connection drops.ModemManager immediately tries to re-establish the connection, but these attempts fail.
After the failed reconnection attempts, the modem gets stuck in a “searching” state and cannot find the network again. The only reliable fix is a full power cycle of the host device.
A soft reboot does not fix the issue, and actually causes the state to change to ‘sim-missing’. We have tested removing the SIM and placing it on my cellphone and it worked correctly. Anything we try other than power cycling or modem reset doesn’t help. The software modem reset (mmcli -m <> --reset) works most of the time, but can also cause the modem to enter a disabled → enabling → disabled loop. Manually trying to enable gets me an ‘Invalid transition’ error.
System Details
Host Hardware: Seeed Studio ReComputer R1000
Modem Models: Quectel EC25-EUXGR and EC25-AFXGA
Firmware Version: EC25EUXGAR08A13M1G_20.200.20.200
Host System: Custom Debian Bookworm (Linux)
Kernel Version: 6.12.34+rpt-rpi-v8
Software: ModemManager (1.20.4-1) and NetworkManager (1.42.4-1+rpt1+deb12u1)
Driver: qmi_wwan
NetworkManager Configuration
Our connection profile is a standard GSM configuration:
[connection]
type=gsm
autoconnect=true
...
[gsm]
apn=onomondo
[ipv4]
method=auto
[ipv6]
method=auto
We have full ModemManager and NetworkManager debug logs available and can provide them upon request. Our analysis suggests the disconnection is initiated by the network, but the modem’s inability to recover is the primary concern.
Could this behavior be related to a known firmware issue? Are there any specific commands we can run when the modem is in this failed state to gather more diagnostic information?
Thank you for your support.