A related thought - in the transition from spinning disks to SSDs, a number of machines still have accelerometers that are designed to park the disk heads if the machine takes a tumble. I don't know how much of this vestigial functionality exists in the machines you use, but it can happen.
Your only solutions will be things that reduce the vibration to your machines - either by isolating your computers, or by acoustical techniques to reduce bass on the DJ platform - cardioid subs, etc.
Yes -what Tom said- pretend it's the 70's, 80's and even the 90's again and act like you have turntables (that actually playback the music -yes kids they actually used to do that :-)
I remember all the shenanigans that DJ's used to go through to keep LF from feeding back through the turntables and all the cushions, foam, patio slabs, hanging springs etc.. -some of it would actually work :-)
Other ideas to look into:
-Check the power as John suggested, but with an older needle-style meter that you can actually see pulses -usually a handheld digital meter won't respond fast enough to see the surges from the sub amp's draw. (the bargraph display on older furman rack light units in FOH racks was great for seeing this)
-From your pictures it looks like the subs are behind the DJ firing through a screen?
Put the bass on the dancefloor not the DJ booth! Isolate the conducted mechanical vibration from the stage/riser/whatever that the DJ is set-up on.
-try to "cardiod" your setup just enough to get a cancellation right at the DJ table.
-Fire-up a tone generator and walk the room -you'll hear/feel nodes and dead spots, try to place the DJ in one of the dead spots! you could go as far as to move the subs to separated blocks to even force cancellation spots.
Also make sure your not killing other spots in the club -I once rattled a bar so much a glass shelf walked off it's mounting, collapsed and dumped the entire top-shelf row onto the floor -including the bottle of Louis XIII -luckily the display case kept bottle from shattering but it dumped out over 3/4 of it :-(