slyone wrote in post #2271563
I read some of your posts on this issue

Hoping it was just having to R&R the lens. I'm expecting another lens tomorrow so that should give me more results.
Yea, I had a bunch of them but I am happily ERR99 free and have been for quite some time now.
Good luck and hopefully all it needed was to be reseated a time or two and the problem goes away. BTW, I did pick up some of the DeOxit from Caig as one POTS member had suggested and about once a month clean the contacts with it. I don’t know if it has helped my camera, but I do know that I cleaned my old VCR heads with it as well and the improvement in picture quality was remarkable. I have since then cleaned my PCs video card contacts, memory contact, and even a problematic cordless phone. The phone was having trouble charging. When you returned it to the cradle, we had to jostle it around a bit until you finally saw the recharge light come on. After cleaning the contacts with a dab of the DeOxit we no longer have to do that.