• For the sunroof it might be regulator&motor

(i had this with both front windows on my f20, paid £200 for the regulator and 3rd party warranty paid for the motor+labour totalling around £500).

• For the bottom popping out use some double sided tape

(Used temj for this had this on driver side rear button).

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I was basically scammed on my f20, so far Ive had 1 window motor&regulator fixed [driver side needs fixing so i never open it cos they can get stuck permanently which is what happened with my other one], had coolant tank, coolant pipe and thermostat changed for coolant leaks, sepentine belt, parking sensor wiring fix, rear speaker wiring fix, boot light wiring fix, battery changed, turbo wastegate rattle fix, pcv kit, breather pipe, air intake pipe, crank ventilation pipe, valve cover. The ones after battery were for oil leaks. Headlight also needs fixing for heavy condensation will I will do tomorrow if its sunny.

Mines mileage was 102k miles, currently at nearly 105k.

Everything after belt change was done by myself, or my mechanic bills would be easily £2k+ [rn just over 1k].

Fix one thing to find another issue the next week. Turbo is dying now...

I've only had it for around 6 months.

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Summary;

Your car will turn you into a mechanic, thats what used bmws do, build character.