A quick update here - so the root issue for the USB dropping from the MX65's under MX 18.x firmware was that some bad coding meant that the MX65's were not providing enough power over the USB for device to run - such as USB LTE dongles. So this has been resolved in firmware version MX 18.107.5 . This might be the only version it is resolved for, we wait to see. I've done a huge amount of testing upgrading the firmware to MX 18.107.5 under various scenarios and I can confirm that this firmware version does 100% fix the issue.
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