Keep getting ACE port A QOS Warning

On a tour at the moment and the T112 surface keeps bringing up yellow triangle and status turns from green to red dot and in Logs get Ace Port A QOS warning the surface lock tick sometimes turns to red x as well. My multi has two cap5 lines tried both and doing the same also at one venue tried there inhouse multi and the same thing ?

Dave

This might help you a little:

https://community.allen-heath.com/forums/topic/2013-02-08-081856