Ziton ZP3 noise fault.

Hi guys.
We have a few zp3 panels in our building, now a few days back the one panel suddently gave me a noise fault.
I checked the analogue values of the devices and they are jumping up and down a lot.
I moved the loop to a new panel and now the problem is gone on the new panel the panel is clean no noise at all.
Has anybody experienced this same problem with the zp3?

Thanx Pieter