We have a few MG21's that frequently go offline, and the only way to get back online is a reboot. There are no logs for the issue in the MX. Anyone else experience this, and know why it happens?
Have you deployed beta version 1.11? Here is what we find in the changelog: MG 1.11 has a number of improvements under the hood with fixes to devices falling offline and issues with enterprise/private APN.