mobile

Hello.
Firstly I would like to say that I am well aware, that there have been threads regarding this problem, however, none of them were of any help. Did not help on solving the problem or even determining the cause. So here is the deal. My nexus 4 is nearly 2 years old. It has had some tumbles, one of them was in January and caused my screen to crack. The touchscreen was unresponsive, but picture was showing just fine. I figured that I would change the screen and digitizer all together. And that is what I did, and it worked beautifully. I was quite happy to have my phone back, and it was working like this for nearly four weeks now with NO problems, what so ever. This evening has been a bit different. My touchscreen has been going crazy. Sometimes it recognizes the touch, sometimes it doesn't, sometimes it registers the touch in a different area and the phone just goes to **** all together. The phone hasn't suffered any damage lately, no falls or anything. As You can see in the screenshots, the screen appears to have a dead zone, right in the middle. Also, the phone lags quite badly, when the touches go crazy.Any help would be greatly appreciated, I would really like to avoid spending any more money (that i do not have) on spare parts, if the phone is unusable anyway. Some of the things I tried, that were suggested as possible solutions :
Factory Reset (both from booted phone and recovery mode) And the touch problems got even worse after that.
Clearing the cache (recovery mode as well)
Opening up the phone and checking the connections (which seem to be fine, since)

Hopefully You guys can help me find a solution, that wouldn't require me any more spare parts, cause getting stuff from ebay is not easy in my country. And I cannot even dream about a new phone, firstly cause I do not have any money, secondly - I love my nexus4, I am very used to it. It'd be a shame to let my friend gather dust on a shelf.

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