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The system has a bypass for overcharging usually kicks in when the outside temp is too high and the condenser can't dissipate enough heat the system will shut off due to over pressure.

Try this: When the MDX stops putting cold air splash the front condenser with water using a hose if the MDX starts to put out cold air then your issue is with over pressure by pass only. If the compressor was failing it would not matter at all.

Solution is to properly fill the system to spec.
We get tons of issues with overfilling and over pressure here in south cali so it's quite normal to know this.
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