Hi,  I have two problems with my conrollers

I am having 6 or more "Hardware: Controller: Control: Module Slippage - Medium priority modules not executing at Module Scan Rate" alarms every 24hrs this is with controller no.3

more worryingly I am receiving "Hardware: Controller: ACN Communications: Not Communicating - Primary Network" alarms. this is with controller no.1

I do not seem to lose control of anything and when I run diagnostics I get a COMM: Communications: BAD

This communication alarm seems to last anywhere from a few minutes to a few hours and can happen a couple of times in a 24hr period and seems to sort itself out, during the alarm state the secondary light flashes on the controller the primary is not lit.

I have heard that a contractor 'could' have leant against some of the wires in our switch room, could a poor connection be causing this and if so how can it be traced

thx in advance for any response.