ELO 5500L touch display issue

So, we have 2 ELO 5500L touch displays.
Debugging info is quite fragmented as I could not find a recurring pattern to recreate the issue. The problem is that either the touch data stops or just one touch is transmitted.
This happens randomly, but after some tests I am pretty sure it is not related to vvvv, as I had a few times where the issue appeared before launching the patch.
I had the impression that the whole thing was degrading with time as if the driver installation is having some problems, today, at last, I start getting BSODs unplugging the usb cable.
Windows 8.1

What kind of tools do you advice to use to monitor for example the com ports, usb drivers, etc?

I am already in touch with ELO, let’s see if they can tell me something tomorrow.