Well I don't know about STOPPING, I've actually seen destroyers crashing into docks before when I'm port raiding. Funniest ever was a destroyer guarding Hartlepool. I was making my way out after sinking the C3 in the Eastern half of the port when TC resets from 64 to 1 and there's a roar. As my IID's GHG is death straight ahead I never got any warning of anything appraching. I jump to the attack scope and raise it, just in time to see a V&W charging for the dock at the back of the harbor at 15 knots dropping DEPTH CHARGES in 16m of water. I got to see the very rare sight of a destroyer blow it's self up with it's own DCs, crashing into the dock and sinking! The game even played the triumph theme it does when you successfully torpedo something!
(though it didn't credit me with the ship's sinking unfortunately. If I'd been there IRL I'd have claimed I sank it, how'd BDU find out right?
)
One last, at no point did I stop and save here so it was not the save glitch that made it crash.