This is of course, happening on Trace. I've been scouring the logs looking for anything in particular that may lead to why this is happening. Haven't found anything yet.... Based on the
bug tracker and
this thread, the issue is not isolated to my server and is not resolved. The bug itself has been occurring for much longer than it has been reported for. I recall experiencing this a few months ago on a different server with a planet I was working on. This is quite worrisome and has caused me to reevaluate whether or not I would like to continue running Trace.... as well as build anything in Starmade....
The one thing I can recommend for Alex and everyone:
Save your ships to local, frequently!! (IMO this should be everyone's regular process when playing on any MP server, including Trace) This may be the only way to ensure that you don't lose any work you put into your ships.