Ignition Problems after the Recall Repairs

I got my ignition switch/cylinder/etc replaced as part of all the GM recalls a little over a month ago. A couple of weeks ago I started having trouble with my keys getting locked in the ignition (when trying to turn off it only turns to accessory and I have to manually release the key using a plunger inside the steering column). I find the timing odd - and I think it has something to do with the fact that they were rooting around in there not too long ago. I called them and they state there's basically zero chance it's anything they did - and that if I took it elsewhere they wouldn't be able to reimburse me if it was there fault. Are they right? Is this just a really odd coincidence? Or could they have done something while they were making all those repairs?

Thanks!