We have a large number of EC25 PCIe modems that we use on embedded hardware running Yocto linux. We have noticed that a number of these show periodic and apparently random USB disconnects and reconnects.
This does not seem to be down the power supply or the load being put on the modem.
Checking the modem firmwares, we have various:
Seems somewhat unstable, with USB device disconnecting and reappearing occasionally
Seems very unstable, with USB device disconnecting and reappearing frequently
Seems stable currently
Is this a known issue with certain firmware? If so, is there a known “good” firmware we can use, and could we flash it remotely from the linux command-line without physical access to the device?