Too many problems for such a young unit.
It's your call. New units are pricey, their quality is not always supreme, repairs are not exactly cheap, Extended Home Appliance Warranty is a scam - so what do you do?
One option is to find a competent, reliable, honest tech, by word of mouth.
Again, it's your call.
I deal with A/C cooling and heating break downs every change of season in my rental homes. The latest was earlier this week with a Nordyne circuit board. That's life and A/C is a necessity.
Let us know what you did.