Yes....secure folder is one of the best securing app....it is hidden as well and you can keep pattern password or pin accordning to your wish.....even the private mode is secure
I also had the same problem while my visit in goa (s7 edge) then all i did was cleaned my usb port completely with small cotton tip as well as the charger.....and in low heat setting blow dry your bottom of your phone.....note: Dont use it in high he...
Flat Ceramic back with Gorilla glass(latest version) and very minimal physical buttons......no pop up camera though.......about the hardware samsung has always been the best