Can't seem to figure out....

My ac keeps going in and out, it has freon and does blow coldish air. When I either first start it or after a hoon, it cuts out and blows hot. I can hear it turning on and off repeatedly with makes the rpms fluctuate below 1k. Could it be a fuse or the fan going out? Turning it off and on fixes it sometimes, but it takes a while.

Another problem I am having is on cold start it doesn't want to go in reverse. It was shaking at 40mph at 1400k and 60 mph at 1900k. Is it the transmission going out or maybe the torque converter? I did a fluid and filter change recently and it stopped, but it is starting to happen again after 6 months.

Any help or advice would be appreciated

It is a 2010 is250 base model

I am stumped on both of these problems