We also ran into the same issue on an HA Active/Passive pair of PA-5220s. Our upgrade path was 9.1.14-h4 -> 10.0.11-h1 -> 10.1.8. We noticed on the dashboard that HA was down, and also all of the interfaces showed down and not configured. In Tasks we were getting the Auto Commit failure repeatedly with details of:
configured traffic quota of 0 MB is less than the minimum 32 MB. Invalid configuration. Please fix errors and try again.
Our uptime was 87 minutes when the Auto Commit finally completed. Once that was done everything appeared to be working as expected. Only one firewall in the pair had this happen, the other upgraded in a normal time window (15ish minutes).
As a note, you can check on RAID with cli command: show system raid detail
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