I've hit this as well, both the camera drift and the explosion post-timewarp. I have a save file that repros, if that's useful.
In my case, the offending part was a TD-12 decoupler, and it still appears in the Parts Manager after decoupling. All my other decouplers disappear from the list, but for some reason this one sticks around and causes trouble.
I've also noticed that if I timewarp quickly after decoupling, the TD-12 gets locked into position relative to my craft. The camera drift only happens if I do a burn before any timewarping. (I guess this makes sense, if the camera is following some kind of center of <whatever> between the two pieces.)
