ARIS server issue due to deleting folders

Hi Experts,

One of my modeler was performing an action in ARIS and server crashed (going into loop). Here are the steps

1) Made a variant copy of a model

2) Went and deleted empty folders (from target folder group) that contained nothing (for some reason , ARIS created an empty ones folder) along with folder that had models, objects.

3) ARIS hung. system was making a request to delete folder every 4-5 secs and went into loop. 

4) Admin was contacted and Admin provided a log showing an exception error 'An Item already deleted in the database".

5) Admin had to bring down ARIS server.

One more information for you : APG tool was loaded on the same ARIS server few days back.

My question is how can a modeler / developer bring down ARIS server? I have never seen nor heard of such a "sensitive" software. Does it mean Admin tool settings were incorrect or is it a known bug or any other issue?

Can anyone of you please let us know what could be the problem? Appreciate your response.

Thanks,

Balaji