Unable to open apps and phone running very hot while charging
So when I got home I found something very strange with my phone. I tried to open Clash of Clans. It slid back to the main running apps screen, but as the app opened up it switched with Whatsapp (which was my other opened app). The same thing happened whenever I tried to open just about any other app. BBM, News apps, Settings. I plugged the phone in to charge and when I tried to open up something else again I noticed that my phone was noticeably hot. The last time it was that hot was when I played Where's my Water (that Disney game) which was very resource intensive. I reset my phone a couple times and even had to switch it off and removed the battery and SIM card for a while.
It still didn't work. I left it for a while and it SEEMS to be working for now at least. This has happened once before, but after one reboot it was working well again. But my phone has been acting up more and more now. I am due for an upgrade now, but waiting on the Xperia Z2 to drop in price a bit as in South Africa it is still ludicrously expensive on contract. And as phones go, they always seem to give issues shortly before you upgrade (almost like they are programmed like that lol).
Anyways, has anyone else experienced similar issues with their phones and know a good way to fix it?
I am currently running 10.2.1.2977 official release and have not yet ever installed a leak. I don't really want to do a factory reset, but I will have to as a last resort.
Thanks in advance.