2015 nissan Armada SL. ac problems.

Ac does not consistantly blow cold air. It may blow cold fort 10 or 15 minuetes , and then start blowing warm air. It goes back and forth. Not consistant with warm or cold . Its really cold when it works correctly. Just started having this problem. anyone else expirienced this ?
2015 armada sl. 119,000 miles.

Update. Seems like the outside temp has something to do with it. AC works perfect when the temp is below 90 degrees. Starts acting up above 90. I read a post , where someone had the same problem . He changed the Sunload sensor , and that fixed it. Dont really want to start throwing parts at it , but the sensor is a cheap and easy to install part. May try it.

Well , no help here , so I will take it to the dealer thursday.