I started with Instagram last year but I've mostly given up on it because I can't post from my laptop. My instagram workflow was post to Facebook, save to mobile, post to Instagram. If there was an export out of Lightroom desktop option I'd give it another go.
One entertaining test is to put a little bit of o-ring grease on the internal side of the buttons in the housing. Then carefully insert camera, take it for a dive without pressing buttons, surface and very carefully remove. If one of your housing buttons is making contact, there will be a grease spot on the camera button. I used this test to identify that one of my housing levers had become misaligned and needed replacement.