Xperia Z1 flicker when data is on
Hello, I bought the Xperia Z1 3 days ago and I've using it ever since, but I've noticied a bit of a flicker as if the refresh rate is too low, it becomes so apparent at gray coloured areas of the screen, but what's confusing me is that it doesn't happen all the time and that it only happens when I turn the data on and sometimes it doesn't flicker but when it flickers the data is definitely on, I've updated it to 4.4.4 in hopes thats a software issue but the problem still persist.
I don't think it's a hardware issue as it doesn't happen all the time and it's always related to data being on, any advice on how to fix this?
Help please, Thanks in advance
Update 1: I noticed that the screen only flickers when the data is GSM only (2G), But when I turn it to WCDMA only (3G) the screen doesn't flicker!