S4 Revos tripping RCD

Hello,

So we have 12 S4 Revos on our front of house bar in our venue, as we can not access that bar at all to focus. They usually work fine, but recently we had a big musical. They behaved throughout the entire, plotting, teching and dress process and even the show (in a high school... only one show). The next day we had our graduation ceremony. We used the same patch, in fact copied the show file. During the ceremony I suddenly noticed that three of the Revos weren't working. I have now looked into it and they had tripped the RCD that clearly links them. If I leave a particular one off, then turn the switch back on the other two work for a bit. Otherwise it just turns itself off, or switches all three off within 5 minutes. I have now unplugged that one, but it is still tripping. This is a fairly new venue, but I can't see how the electrics would have changed.... Is there a way that Revos are likely to suddenly start shorting? Has anyone else had this happen?

Many Thanks,

Chris

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