Originally posted by NZ_Ross Maybe battery contacts in the camera need a clean?
That did cross my mind, but the shutter count is only at 7,152 which is something like a dozen battery changes, so I would have thought wear and soiling to be unlikely? I did get it second hand, but I'm responsible for over 90% of those shots and the only moist conditions it has been in were in Singapore over 2 years ago.
The bit I find most perplexing is that the depleted third party battery was 100% reliable even when the other three were not.