Noisy coloured pixels on my Fairphone 2

[paulakreuzer]

It’s this one:

Strange screen issue

Last week I broke and replaced my FP2 screen (here the full story). The new screen is working fine, but I have a strange issue happening that I never had before. From time to time (I am looking for a pattern but I have not found one yet), my screen gets all blurred and dotted (see pictures), it stays like this for a couple of seconds and then goes back to normal. It is not a huge issue, it is just an unexpected behavior, but I would like to solve it and, especially, to know if it is a symptom…