@John_Mike this sounds strange… You mentioned the Balance 710 also experiences the same issue (unexpected reboot) in the latest firmware, is it referring to firmware version 8.5.4?
If that is the case, can you load the firmware 8.5.4 from this page, and download a Diagnostic Report after an abnormal reboot, then attach it to the ticket for our team to take a closer look?
You may quote this forum thread (PepLink error message regarding time synchronization and device startup) when submitting a support ticket, so the support team member is aware of the case background.