That blows. You really need to, calmly, deal with whoever sold it to you and get a contact at the company. Usually emails AND calls are important. The distributor and company did not collude to ruin your sessions, so you just have to get to the right people. I maintain both HEAR and Aviom systems and they need some care.
In the meantime, how did you integrate it? Is the distribution box in the live room or do you have wiring all over the place? Try disconnecting all but one feed and test for failure. One dodgy facility run or pod cable can take the system down, even if it is not being used. They have some protection for that, but a bum run can cause problems. If you are using the same stranded CAT5 cables supplied with the unit, they should be tested and verified depending on frequency of use. The cabling IS fragile; much more so than a mic cable.
I know the anguish, and it is difficult but necessary to chill the emotions in order to suss a malfunction and then friggin' blow it away. That is what tech is all about.
Mike
PS: How do you know the power supply is OK?