When user press on Print button or any button, system will logout from QnE system automatically. This occurred occasionally for one of the workstation. Due to this occurrence, system will hang up 1 user as uncompleteness of logout user in Firebird.
To check :
1) PC memory low,
2) close some other files or program, because too many files and program in use concurrently on user PC
3) Reset Firebird in Control Panel (Stop & Start again)