As far as the AC is concerned, the performance does get affected by AC cabin filter too which needs to be replaced on yearly basis. If the gas goes out, that may be a weak spot which leaks. The metallic pipes carrying gas are sort of sensitive specially at joints which connect different hardware related to AC piping. Also a few 8th gen have compressor issues.
But incase of a compressor problem, it works fine for a few minutes then starts throwing normal air out of the vents, if the AC button is switched OFF for a minute or so and switched ON again it again starts working fine for a few minutes. The process can be repeated (ON-OFF-ON) in such a scenario of faulty compressor. Observe if this is the case.
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