If I am understanding your post correctly, you are saying that this has been a problem since the system was put in. Judging by the hardware and software you mentioned, it sounds like the system is relatively new. Was the system installed by an outside integrator or was it done in-house? If outside resource was used, they should be helping you troubleshoot and fix the problem. If it is an in-house installation, go back to my post and answer question 1, 4, and 5. Along with those, do you see any errors in the WW Logger on either the InBatch servers or the InTouch nodes?
I'll try to help if I can, but the help you receive here is only as good as the information you can provide. Please provide as much detail as you can.