Unable to assign technician

Unable to assign technician

Hello, 

I'm currently experiencing an intermittent issue where we're unable to assign a technician to a request. There are no error messages on screen, once you click saves it looks like its updated the ticket but leaves the technician blank.

Seem to experience this on a few tickets every few weeks, any ideas what could be causing this?

Running version  9.3  Build  9301
Thanks 
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