My Nokia 5800 works fine in hot temperatures.
But at night when it gets cold the screen goes blurry and I have to heat the phone before the screen looks normal again.

This problem is alright in summer with the hot temperatures but I am scared that with the cold temperatures of winter my phone will always be blurred.
I've googled this problem and it's quite common.
Nokia can fix it but my warranty just expired so that'll be about 100$ I think. :(

Has anyone else got this problem?
I'm a bit short for cash so is it possible for me to fix it myself by replacing the screen?
If I try to replace the screen, will the problem go away and does anyone know if it will come back later?

If the 'blurred screen' in cold weather comes back after I replace the screen I'll probably buy a cheaper phone. :(