Do you have issues just using your 580EX II's on your camera and via Canon optical triggering.
The PocketWizard issue, that they tried to blame on Canon, was due to their "overclocking" the IGBT circuit, it was not an issue for people who didn't use Pocket Wizards and it resulted in the flash tube damage, not battery housing and door.
I absolutely don't trust Yongnuo, third party reverse engineering is fraught with problems and if I had one issue with it once I wouldn't give them a second chance.
If they are still under warranty I'd class them as lemons and demand an exchange. If they are not then I'd sell them and upgrade to the 600-EX-RT's, which are good value when compared to any other flash and full wireless triggering system out there. If you can't afford the 600 then I'd be tempted to go all YN, there are less issues with all one make, though there are lots of third party options to choose from, Godox, Phottix etc etc.
If it is only a problem when you use the YN's then why blame Canon? Yongnuo are a bargain basement, third party, reverse engineered, Chinese hack, with zero quality control and a huge catalog of problems and issues that impact complete models or are limited to a short production run, they have their place but you seem to have a bad set.
i'm hesitant to say anything here, but this response is close to nonsense. do you use yongnuo gear? if so, have you had these sorts of issues (ie. flashes breaking)? also, you hear about people bashing the things online because people who are unhappy are the ones who write things online. if i trusted everyone who bashed equipment online i don't think i'd ever buy anything from anyone.
the fact is that YN-622C's are cheaper than the alternatives, and the quality is a little low on certain things. however, they do nearly everything that the pocket wizards do at about 5 times the price. should i not use them because they are "cheap?" should i fork over all my money to canon on their wireless system?
according to you, i should bash kias because compared to ferraris they are garbage.
i am glad that there are companies out there reverse engineering things, otherwise we'd all be forced to pay outrageous prices for things - but i guess you like that.
anyway - if your triggers are causing that, that stinks. i've used those triggers with canon flashes for a long time, and i know plenty of other professionals who have used them, and i've never heard of anything like that. either way, i wouldn't keep sending them back to canon. either get new triggers or get new flashes, because it sounds like you're just throwing money away.