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Unfortunately no field upgrade.
Have you done any more Timer Write attempts to see how transient that message from the PLC actually is. This will not be limited to Write. A Read could have the same issue making it difficult to know if the values you are seeing displayed are actually from the EZIO2X4 or left over from the previous Write request. You will have to look at the Insteon Traffic tab so see if there has been traffic that interfered with the current function request.