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CHMI 5.1 Client (SCADA) hanging issue

I am using CHMI 5.1 in two STANDALONE Work stations and everything is working perfectly, but 1 time in one or two days my client (WS) SCADA hangs that do not allow any operation but field values updates, however it does not happen in both WS's simultaneously.

So it requires either restart or logoff WS to again start WS.

We are using CPU PM581, and there is no loading issue.

Please suggest me whould should I do? As plant is running.