My Panasonic G7 has been giving me an error message on the first shots I take with it. The shutter stays down until the camera is turned off and then back on. After doing the process a bunch of times, the problem stops until the camera sits unused for a couple hours. The longer the camera sits, the more shots it takes for the problem to go away.
I tried swapping batteries, SD cards, and using a blower on the shutter. None of those things have fixed the problem.
Please leave a comment if you're having the same problem, know of fixes, or sent your camera in to be repaired.