True, this same problem happened to me. BG-E2N users, please note this. The screw mechanism is a really bad piece of engineering. I took my camera out for a telephoto shooting session during this winter on the Romanian Black Sea Coast, and the extreme cold must have caused the screw to tighten excessively. When I tried to unscrew it, the plastic mechanism broke and I am now left with an irreplaceable grip. I can't even begin to tell you how frustrating that is. And to top it all, the service store has never got replacement parts for the grip. I'll pay them a visit next week and attempt to settle this.
Scrappy, was your grip damaged in the separation process? Did you store have replacement parts for it?
Thanks
Yup it was indeed. Thankfully though, went to CSC and they had it back with me within 3 days, and I paid just $9. Of course, they initially told me that I would have to pay around $50 for "labour and parts", but I argued my way to having to pay only for parts.
However, when I use my BG-E2N now, I face the problem of having to re-tighten the grip every hour or so, a problem I never faced with my BG-E3 on my 400D. I don't know why it happens, but I guess it's better than have a screw that doesn't turn at all.