I don't know what happened,because it never before. 1. 3CX Phone system failed(windows event show application failed) and 3CX Phone System service just stopped. 2. If call more than 40 call concurrent 3CX assistant client event just not update. etc call answer but show available,Call ringing show available and no popup Remark : before it work 20 agent,but! now not work 60 agents.