Communication timeout occurs sometimes.
There is a possibility that communication between PE-ViewX and PE-Expert4 don't complete within time.
Extend communication time by the following procedure.
[Settings] menu > [Offset of Timeout] > The following dialog is displayed.
[PE-ViewX] column: Sets the extension time of PE-ViewX communication.
[PE-Expert4] column: Sets the extension time of PE-Expert4 communication.
Initial values are 0(s).