Yes; I have a save file that it keeps happening on.
Exactly what is happening to wake up the fortress, besides my units being nearby, I'm not sure--and they can be nearby for a long time with no apparent effect on the fortress, then suddenly it attacks.
If it helps, I set up the Stalin's Fist nearby and built some TIGRs with it; perhaps these were supposed to hold their fire against the fortress but don't. That's just a theory, though, and I don't think I've ever seen them shoot at the fortress without an order.
Edit: Is there a way to identify which save file is the one I made right before the issue occurs? Looking at the Saved Games folder, it seems that only some of them have references to the mission names, which I'm assuming are the starting files. I'd like to find and upload a file from later in that mission.
Edited by Sammy Stallion, 01 July 2018 - 01:27 AM.