Thank you guys for the response. Yeah im looking at getting the Leak sentinal so that i can take it underwater at pressure.
Ive since spoken to Seafrogs customer support and they suggest it to be the AF-ON button becoming depressed due to a slight deformation under pressure. I tested this theory on the camera and it definatly seems plausable as when pressed down it renders all other buttons, bar the shutter and display button, unresponsive. As a result they suggest I take off the rubber end inside the housing to increase the distance between the buttons so that it doesnt happen. I have yet to test this under pressure and am not sure when but will update here once i do. Thank you all for the help!