OUCH....sorry to hear,
Are the collimation screws tight? If all the screws are loose, I can see the secondary mirror becoming loose, but normally, when adjusting these screws, only one at a time should be messed with at small increments. I realize you stated that before you guys touched anything, but was there some sort of collimation attempt earlier? Now, if you have not touched these screws, and they are tight and your secondary mirror assembly is loose, that's certainly not good. How old is your Evo Mount and scope? If under warranty, call Celestron, but if you or anyone has messed with these screws, corrector plate or secondary mirror, well, that "possibly" could void the warranty.....but still worth calling.
Was this scope dropped? I'm just trying to think about what would cause the secondary mirror assembly to be loose, should nothing else be accomplished that might contribute to this. I've had my C8 on numerous road trips, about 3 collimations, where one was after installing Bob's Knobs. I've been using this orange C8 since 2014. I had Celestron replace the SCT due to the primary mirror flaking.