Lost SCWrite ... [WebWare SDK]

hightower

We are communicating between a robot application and a higher level system by means of SCWrite with bool arguments, for the sake of response speed an interrupt capabilities.
Frequency of SCWrite is about 1-3 per second, sometimes grouped in bunches.
Sometimes, about 0-4 times a day, we encounter the problem that though an SCWrite is issued, we do not get the corresponding AxRimbaseLib.AxHelper.SCWriteEvent.
We do receive loggs from directly before and after the SCWrite statement, so we are sure that the SCWrite is executed.
No errors concerning the IPC queue are logged on the robot. SCWrite issued afterwards work completely normal.

Communication failure leads to production stop and restart of system, thus highly undesirable and anoying.

We do use WebWare SDK 4.6 during development, and a machine system setup is as follows:
Windows XP Professional SP2
Robot IRC5 with RobotWare 5.06.7002.00
Interlink 4.6.0032

Is this a known issue, and how to avoid it ?