I'm having the same issue. Dropped down to 2018.3 for now.
Yes even I face similar issues, even the application doesn't run after launching most of the time.
It was really good before 2018.3
Looks like there isn't a great solution here? I've noticed that it always happens if I click on a step and I haven't signed into the data source connection yet. That'll usually 100% of the time spell doom. Outside of that it's still happening every so often for random reasons.
Now I've noticed I just get failures that require me to restart the application. They error codes never seem to actually tell me what's wrong either.
All of the above. Worked for a week on a flow, it was running flawlessly for a day, then it suddenly just seized up on me. CPU goes to 100% and it eventually just crashes. No real explanation of what's going on. Opened a support ticket, hope they can figure it out.
Any updates on this? Using 2020.1.2 and having maxed out CPU.
There are a couple of variables that make it really hard to tell.
#1 We don't know what your flow looks like (data volumes, type & order of steps, etc.) vs. the others that were reported here.
#2 Given that Tableau Prep has had 6 or 7 releases (it's on a roughly monthly release cycle) since this thread was posted there could be some very different issues cropping up.
If you can post more details about your flow then the forum volunteers might be able to help, in any case I suggest reporting your issue to Tableau technical support.