Window, any advice what is causing this

last month
last modified: last month

Hi this happened about a month back and I've just literally seen it happen again in front of my eyes, on my balcony, the window frosting outside(whatever it is called) is cracking/peeling, this is a lining behind the window. Directly behind that is insulation, and then there is the wall inside my apartment, plasterboard, I'm assuming.... It's very hard to explain without attaching a video. I just can't work out why it is doing it. Number 1, it looks awful, Number 2, I'm concerned that something sinister is going on between the window/insulation and the internal wall. The insulation seems to have moved too. Any advice?

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