I opened up a ticket with support. We weren't able to figure out the problem, even after escalating it to development. This could be partly my fault. Disk-usage was approaching 100% and I didn't want to wait and see what happened when it got there. I ran into this problem before on another PA-200 and we updated the firmware, which fixed the problem. I performed an emergency firmware update which fixed the issue on this PA. Disk usage fell to 75%. I haven't had any problems since. Regarding my ticket, I was told there wasn't any further analysis that could be done since I did the upgrade, but it's likely the problem will occur again. I guess I'll just keep monitoring the firewall and wait for it to happen again. Also, when they got root access to the 200 they deleted several large files from this partition and it didn't affect the disk-usage, it stayed the same, in fact at one point after purging all the old version software not in use, the disk space increased. This is really odd behavior. This really seems like a bug. It sounds like the PA is designed to purge files when the disk usage threshold is met but it's apparent that this is NOT happening as it should be. I have not had this problem on our 500s or our 3020s. I hope this information helps somebody.
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