I have recently purchased one of the development kits and have encountered an issue where the Quectel modem is repeatedly “disconnecting” and then “attaching” to the Pi.
The issue is similar to Device files keep coming and going every few seconds in that the output of dmesg shows the various devices (ttyUSB0-3) repeatedly disconnecting and reattaching.
I have already disabled modemmanager, but this has not made a difference.
Is this possibly a power consumption issue? Any advice is appreciated