These are possible reasons EA Utility may stop working or freeze, in the case EA Utility is well written code but still problem persists
Problems :
1. MT5 Beta build : Any build which is not stable version may cause problems to any EA Utility
2. Conflict with any indicator : Indicators runs on same thread so there is high possibility that your EA Utility may freeze due to any indicator. https://www.mql5.com/en/forum/456144 this forum confirms a reply about such issue from a reputed moderator with 6+ year experience in MQL site
It has nothing to do with EA Utility. Run your Ea Utility without any indicator to see if problem is solved.
Possible Solution :
1. If its a problem due to beta build, roll back to previous stable build
2. If its a problem due to conflict of indicator, a rewrite or troubleshooting may require for the indicator causing problem .