Battery Life / Recharging issues after latest Update

I bought the Xperia Z2 beginning of April and it was fine. The battery lasted for about 2 days with Active Hotspot continuously running for approx. 18 hours. After updating to the latest software version, the phone runs pretty hot and with Active Hotspot on, while hardly using other programs, the battery is empty after 8 hours, despite having the phone always on the charger. Several times an error message pops up, telling that the phone consumes more power, then the (original) charger is providing! Is that update rather a downgrade? Or is it the intention to get the Hotspot literally hot?

Hi there!! I've been using my Xperia z for the past one year. Till last week I didn't had any problem but now I'm not sure what happened to my mobile.. I have listed all the issues below. I really need your help and support to solve this issue and please get me a permanent fix..
1. Battery is draining too fast(very fast)
2. Mobile is always hot even if I don't use. When start using apps like game, browsing or watch any video, I feel that I'm holding an induction stove in my hand.
3. "Throw" option is not working
4. When I make a call I don't hear anything through earpiece rather I'm using loudspeaker speaker.
Plzzz help me and get me a solution.. I'm afraid to take my mobile to service center.. Please advise what needs to be done..

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