The map is "Ozkansas", currently up in LW arena 12-13-12 @ 10:41 CST. The event that triggered the reset was the relocation from the rear to the front.
While the industrial complex/strats were retreated to the rear, I took a Mossi Mk IV in and completely destroyed all of the ack on 2 of the 4 auto ack towers around the AAA factory and received a "Hard Auto Gun XXX Destroyed, it will down for 58 minutes". Guns C02GNH194-199, 19A-19F, and A0-A1 were all destroyed twice within a 20 min window (I did not make it to the second tower, the fully operational battlesta.... er... ack tower was a bit of a surprise and it didnt take well to my Mossi being there. I do not know if it matters but the AAA factory was at %76 during the first run and still was upon return less than 20 mins later).
Basically,... it appears that the auto ack resets when the strats move from front to rear. The actual damage to the factories did not change according to the clipboard data.