Welcome to the forum and your GLA.
Any AC system, whether it be in a home or vehicle, needs a clean condenser section. This is the system's discrete radiator and as such the fins especially need to be clean/clear of debris so that cabin heat may effectively be transferred to the exterior.
So, there is some merit to the service entry if it were truly blocked by environmental conditions (dirt, leaves, twigs, etc). When washing our GLA I make sure to stream some water thru both the AC and the engine's radiators. Same for a couple times my home's condenser during the cooling season. We have a lawn service and post-mow they use powerful blowers that kick up a lot of dust and so mine gets coated.
And of course cabin vent/duct airflow blockage and/or the cabin airflow fan itself could also be issues.
Less likely is a leak in the refrigerant line requiring repair, refill and pressure balancing. Don't buy one of those DIY refrigerant canisters. First off it's probably the wrong refrigerant type. But more important is that a certified pro will balance the high/low pressure sides which is very important to proper operation. That DIY "solution" only addresses the high pressure side and therefore can cause too much refrigerant to be applied which, much as too much oil, can actually cause more problems than it resolves.
Other sources of noise are the belt for the compressor slipping or its pulleys unbalanced, and the vanes of the radiator fan(s).
btw: Do you notice some water dripped on the garage floor/driveway after a drive in hot weather? If so that is normal condensate dripping off the AC cooling coil and actually a good thing, as if it doesn't then the coil itself is freezing up due to poor airflow across the coil, again usually caused in part by a dirty condenser radiator. Caveat: if you're in a very dry desert area you may not see condensate as it is quickly evaporating.
Now that you're on record with your dealership's service should it happen again near term they'll have to do more diagnosis and further rectify if necessary. Do let us know if you have continuing issues.