Have you tried: Settings>System> Power & Sleep> under Sleep select OFF for “Save me power when my device (or Cortana if you’re logged in with your Microsoft ID) knows I’m away”? Also in Power & Sleep, if you scroll down to Additional power settings and open it, you will have the option to “Change advanced power settings” for your Balanced plan. In the pop up window, under Sleep, you can set hybernation to Never while on battery power, by default it’s set to after 240 minutes.
Thanks for the quick response, but I have already tried all the things you’ve mentioned except for the “Save m pore when my device knows I’m away”. I unchecked it now.
Hopefully this will help, cause this is ridiculous having to boot up every time I pull out my device from my bag.