Well I think it is the Mediator that is acting up.
I replaced it with my old zorro bridgecard and now everything works fine.
Any suggestions on how to fix a Mediator? :-)
I do not think it is done with a cleaning etc. since it is only a year old. I think something is broken. But I could be wrong :-(
As suggested before,pop each chip on the mediator bridge and inspect/reseat the chips. sockets often develop contact problems like this.
worst case you may need to send the mediator bridge back to elbox and have it fixed.
Mech