My Lumia 950's battery performance has drastically deteriorated in recent days. I am currently on build 10586.164 and the battery performance was the best in the preceding build. I had to charge once in 20-24 hours but now I have to charge twice a day and it still barely makes it. Any particular reason behind this. I am also not receiving notifications from WhatsApp recently. I have to go in the app to see if there are new messages.