I found two patches that were always silent, but not the same ones you found. Mine were - DD GoodKarma and DD Tick-TockPad.
But I think I may have the reason for the silence anyway.
The reason my two silent patches didn't sound was because both of them have the pedal controls selected, which silences them if you don't have pedals connected.
That wasn't the case with your silent patches in my version of the CS80V, but it may be that we have slightly different patch edits. Try checking if the pedal controls are selected on your silent patches as follows:
look at the two grey buttons to the far left of the keyboard, marked EXP and WAH. Click on both of them to bring them up. If either are down, there's no sound.
You can't simply re-save these patches when you've solved the problem (because they're factory settings, I think), so if you want to use them you'll need to save them with new patch names.
At first I thought there may be a corrupt patch in this bank as well, as some odd things appeared to happen. But I'm beginning to think it may be a computer glitch of some kind that's now resolved itself. I'll keep checking things with this bank for a while, though, I think.
Please let me know if what I've said helps to solve the problem. If it doesn't, we can try something else.