Engine Clicking And Tapping Noises problems of the 2016 Subaru Outback

Battery dies unexpectedly within a few minutes of the vehicle off and in accessory mode only (I. E. Car off, radio or lights on). Vehicle will not start without jump from battery pack or another vehicle. Car will not even crank but will only make a clicking noise. Occasionally, engine timing will be affected after jump and misfires will occur causing vehicle to run very rough until restarted, at which point electrical system seems to reset itself. To date, dealer has found no direct cause for the problem (I. E. No parasitic draws) but has replaced the battery (which are under warranty) multiple times. Problem has occurred numerous times since it was purchased in late 2015.