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Have someone start the engine while you look under the hood at the a/c compressor. When this noise is present, is the compressor engaged? You would be seeing the center of it turning with the outer ring that the belt rides on.
I’ve check the belts and they are good. The A/C clutch is not the problem because the squeak is there when the A/C is turn off. Now the squeak are getting more frequent and louder.
It actually makes it easier to diagnose when it gets more consistent. Intermittent issues are terrible even for the pros. Get a spray bottle of water and spray down the belt. Start the motor and spray a bit more. If there is no noise when there usually is you have a bad belt, and I would change the belt, tensioner and idler pulleys as a set with Gates units so you don’t have failures later. You said you checked the belts and they were good. Well not all bad belts look like they are about to fall off. Try the water test and let us know what you come up with.
if the sound is frequently now try t remove the belt of alternator while the vehicle is running and watch the sound if it disappeared so the alternator belt is faulty if same sound still so remove other belts and check sound
When you start your engine and get a belt sequel that last a few seconds and goes away. Look to the alternator belt. An alternator will put a heavy drag on the belt right after start up to recharge from the power used by the starter. If you run down the battery a bit say 5 minutes of headlights before you start the engine. The noise should last a bit longer maybe sound louder. Might help to diagnose.
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