ThereĀ“s a bug in the Mobile Product Pages - the pages they freeze (you cannot scroll down) when you access with a smartphone - only unlocks 10 to 20 seconds later. Tested in 3 Android devices, 4.0 ; 4.4 and 5.0 (last one a LG G4).
I think its not anything wrong in our site, but a bug in the theme, because when I access to the product pages on your theme demo, the result is the same - they freeze