After many back-and-forths with A2Hosting this is their last correspondence:
A2 Hosting Support
7:20 PM (31 minutes ago)
to michael, me
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Hi Michael,
Thank you for waiting.
I tested your plugin and I get the same error. There is enough space on the server and the limit has been adjusted.
Can you double-check with your Plugin Support and if there is something unusual on their logs as well?
Let me know and we will go from there.