Discharging/warming up iPhone 6S abnormally!!!

Im really disappointed by this last update from 27.04. I have noticed that watching video with YouTube app for 10 minutes discharged my battery of iPhone 6S on 8-9% and the whole iPhone warmed up really a lot! Even hotter than using Skype for 30-40 minutes. Accumulator statistics showed 15-22% after 10-15 minutes for YouTube. I found discussing the same problem on forums and deleted/installed YouTube. It helped and now no warming up or significant discharging during 10-minute video watching (even on 1%).

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