So I was gifted some sweet mining turrets to get started, and the first one was fine- I could use it and it cooled down over time (fairly quickly too); but after I dragged 2 of the same turrets from the alliance vault, all hell broke loose. The two turrets were locked at 100% overheat and wouldn't cool down, even after 20 minutes of doing nothing (maybe even longer), relogging didn't fix it.
When I removed all three turrets (one working, two bugged), and put all of them back on to see if it would be fixed; all three became permanently bugged. Another player tried equiping them onto a ship with much larger power generation to see if that would cool them down (each turret required around 6.4 TW to fire at 100% heat) he had a few hundred TW.
Didn't work, they stayed at 100% heat, nothing could be done; lost 3 Really expensive mining turrets in the process, and encountered a game breaking bug. (Can't mine, and Salvaging is still really bad)