question about the basic properties of water

[theben]

sometimes when i take a .5L bottle of water out of the freezer, it is in a liquid state but when i open the bottle, it then starts to partially freeze. it turns into a slushy, clouded mixture from its usual transparent, liquid state. it seems to develop some ice crystals. i have a feeling the act of opening the bottle may speed up or start this process, but i am not sure because i always open the bottle (no testing of other outcomes)

what is going on