It sounds like the condenser may have frozen up. The A/C gets very cold and any moisture in the RV can collect on the fins inside the air box, freeze and stop the airflow. That would make it sound "different" and when the compressor stopped, the ice would start to melt, dripping down into the RV.
There is a "freeze plug" that is a sensor, usually on a white wire, that is inserted in the fins of the condenser, very high up near the top of the air box.
First, turn off the air conditioner, turn off the A/C circuit breaker in the power panel (or better yet, unplug shore power), then remove the filter assembly, use a flash light, look up inside the air box. You'll see a metal box and a lot of wires going to it. That is not what you want. Above that you'll see one (probably white) wire that has a small plug on it. The plug is pressed between the fins on the condenser. Make sure it hasn't fallen out and is securely inserted between the fins.
You might also want to remove the inside ceiling assembly and look up into the air conditioner. You'll see, at each of the 4 corners of the hole in the ceiling, a long bolt that ties the rooftop part of the A/C to the trailer. Make sure those bolts are secure, but don't overtighten them. If you look at the top of the square box you will see a 1" thick foam gasket. That gasket should make contact along the entire surface of the RV roof and the bottom of the rooftop A/C unit, but it should not be compressed so much that it is deformed. Snug only, not overly tight.
Good luck.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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