I have an a7 with Sony VG-C1EM battery grip which worked great for about 6 months but now loses power angling the camera down or just bumping it when turned to portrait.  I put tape on the back of the batteries to make them more snug but that made the cam not power up at all.  Im not sure which of the 4 contacts are shifting during movement.  When I return to using a single battery in the camera without the grip it has no issues whatsoever.  

 

I purchased the grip from Bestbuy about a year ago for $248 so I would like to get at least a few years out of it if not much longer.

 

Any experience with this issue and any solutions that have been discovered?  

 

Greatly appreciate any help in advance

Make certain there's nothing stuck in the slots where the vertical part goes into the camera that's preventing contact from being made. Mine picked up some fibers from the camera bag and caused intermittent problems.

Clean the contact pins.