Seglei zmax mini button issue

[D3z216]

I have a zmax mini and for the first 3 months this thing has out preformed my highest expectations. Recently the button has been acting up. Sometimes it fires other times it doesnt most of the time i have to press real hard to get it to work; most annoying part is that when i go to fire it, it starts fine then next thing you know im in the menus changing things i dont mean to change. Does ANY ONE know how to take it appart and or fix this problem? I purchase a zmax v5 as a replacement but i kno the same thing will happen to the v5 any suggestions would be much appreciated.