My A6300 stopped responding to any button press besides the shutter button one day. I couldn’t figure out what was wrong with it. After some reading online it appeared like the shutter button was getting stuck in the “half pressed” position, usually where focusing happens or exposure lock occurs. The stuck button was making the camera not respond to button presses. Of course, my camera was 1 month out of warranty.
My temporary workaround was pushing the shutter button repeatedly to get the button unstuck, but eventually even that stopped working.
I decided to take a most drastic measure. I grabbed a can of DeOxit and sprayed a very short burst of fluid between the ring that controls the power and the shutter button. I mashed the button a dozen times to get the cleaner into the button then wiped everything off.
All the sudden the buttons started working correctly!