I noted recently at DPReview that Canon has finally made good on its promise to put out a free repair for all BG-E2 battery grips with serial numbers less than 096000 and free replacement of all of the old-style BGM-E2 AA battery converters for the BG-E2. My own BG-E2 falls into this category, but doesn't seem to be as badly affected as many. I will probably send in the BGM-E2 for replacement, but I can't decide if it's really worth the downtime to detach the BG-E2 from my camera when the only problem it has is very occasional glitching, that may be not be fixed by a change in the way they handle the electrical contacts.

More information can be found on the above linked web page, or by calling (toll-free) 1-800-828-4040.