It's dead.
Well, that's not quite true. The Pi is fine. Dandy, even. It's just not doing any mining. And I'll tell you why.
The Pi itself runs some custom python code that I wrote (ostensibly) to mine Bitcoin. It performs a single hash per second, which was behaviour I couldn't figure out how to get out of the standard bitcoin-core client.
It needs to talk to a bitcoin client, however, to pull some data from the network in order to perform the relevant mathematical gee whizzardry.
That node runs on my Unraid server, which is a Linux-based NAS operating system running on some old hardware I had lying around and stuffed with thicc HDDs. It runs a bunch of docker containers, one of which is a bitcoin node.
This node doesn't store the entire blockchain; I was a little impatient waiting for the full download and validation to complete (or I was worried about space on the docker container? I can't remember), so I decided to run a pruned node - basically, it stores only the last X blocks to save on disk space.
I usually leave this running 24/7, except when I'm out of the house for a long time. Recently, I was out of the house for about two weeks, so I shut her down.
Trouble is, the blockchain keeps right on going; so by the time I got back and booted it back up, the node was so far behind that it had no way to validate the new blocks - the chain was broken.
So, I have to wait for the stupid node to catch back up and truth be told I've been dragging my ass on this. I'll do it.
Just... not now. Soon, though.
Probably.