We have four node cluster, one gateway, three workers, two worker is running data engine. Our cluster data engine is not stable , it goes down frequently( 3 or 4 times in a week). We been recycling app/server to fix this issue but we like to get to the root of issue working with tableau support - which is on going effort - mean time looking for your help to fix this crazy issue making me wake at 4am :-)
Did you had similar issue? how did you fix it?
Any point to look at the logs files for data engine?
This doesn't sound familiar to me, but the very first thing I'd do is get off that 8.0 release - Tableau 8 is currently at 8.08, and many of those 8 additional releases have solved stability and other "strange stuff" issues.