iphone 6 plus ios 8.2 freezes up

It only happened of late that when I tried to type my messages be it on whatsapp, wechat or even safari, it would freeze up and the only way to get around it is to hit the button on the right to go on standby and then wake the phone up again and access the app to continue.

I realised I've also been having my phone freeze up when I wake it up from using TouchID, and tapping on my Setting icon. The only way to get around this problem is by doing the above as well.

Does this happen to anyone and if its a problem with ios 8.2?