Great app but... Puts my ipad to sleep while watching something

Works perfect on ipad mini 2 but fails to load mkv files properly on iphone 4s. No youtube atm hopefully that gets fixed. After further use I havent been able to keep the app from letting my IPad go to sleep mode while watching a movie or show, pretty annoying.

SandmanGrewall about ArkMC Pro UPnP media streaming, v1.8.4