[Snapshot Pro] Managed Backup deactivating by itself each day

For the last two days, Managed Backup has deactivated itself each day. It had been running fine for several months. After the first incident, I clicked "Activate Managed Backups", then ran a manual backup. That was okay. The next day, when Automate! tried to run a backup, it failed because Managed Backups was deactivated again. This appears identical to this issue: https://premium.wpmudev.org/forums/topic/snapshot-pro-managed-backup-on-sites-turning-off-and-have-to-re-setup