I was originally thinking this issue was related to Fast Travel since the issue occurred as I was fast traveling to the bed in that base, however I just had an entire base auto-decay on another square with an active claim tower even though I had visited that base the day before yesterday. This time I saw the decay in the log and hadn't fast traveled anywhere yet.
This must be some kind of bug related to decay inside claim tower range, or maybe a bug with the claim tower itself? Is there a tried and true method of reporting bugs? I'm not sure I could even provide enough information to even make the bug report helpful...
We lost massive amounts of resources, items, etc., so I think we may be done playing the game for a while until more bugs are fixed (if ever).