Broken shower door.
2001 LY XL390 Moved coach during repairs, had not latched shower door. Lower door pivot had probably normal 12 years of wear/corrosion, but unlatched, swing free, heavy door, ... The bang concerned me. The crash of tempered glass sickened me.
Need lower pivot and or door. Frame is fine and will just use lexan if needed. The pivot has been surprisingly difficult to locate.
'Of course that's just my opinion, I could be wrong'.