The touchscreen on my phone randomly stops working throughout the day. Has been doing it for around 2 weeks now so getting to the point where I need to sort it. The screen stops responding, I toggle the screen on and off, the screen is working again. Seems to be random as I cant consistently replicate it. I presume its a hardware fault as I have done a full phone wipe from scratch and still have the same issue. So is this a cheapish fix if I take it to an apple store or another company, or will the cost of repair basically 'write-off' the phone?