Air Con

For the gas to leak out that quickly there must be a component failure somewhere. I've seen much older vehicles still holding their refrigerant. 

Problem will be convincing the dealer that it's failed prematurely 

Unless it is just a leak from a seal or valve, fairly easily fixed. 

Just in case, first check if the air conditioner drive belt is intact. My air conditioner recently stopped working too. Good thing I opened the hood

Took my Jimny to an independent air con specialist this morning, who put his gauges on and checked everything.

My air con was still working correctly, but was a little low on gas, although he did say that it should be checked and refilled every 2 years, but no one bothers.

He said that the amount of gas loss was consistent with a 5 year old car and only had to add a small amount rather than a full recharge.

My compressor went from running all of the time, to only starting up for short periods and I now get a strong stream of cool air in the cab.

He was 100% sure there are no faults or leaks, so a 30 minute visit has fixed it.