I would look at how you are using it or the drain system on the ac itself.
As you run the AC water vapor in the air will condense on the coils and drip into the collecting basin (under the ac unit). There should be a drain hole(s) in the collecting basin that allow that water to run out onto the roof. If mud, leaves, or bugs (spiders) block that hole, or holes, water can fill the basin and with nowhere to go will then enter the air intake or exhaust and drip inside.
The thermostat should be set NO LOWER than 10 degrees below the outside air temperature (good advice for your house too). This should allow the AC to cycle on and off and remove any frost or ice that forms on your cooling coils.
Once there is frost on the coils (from setting the AC to 65 degrees and running it constantly) air flow through the fins begins to drop off and the frost becomes ice. This further reduces air flow and the ice spreads until the AC is ice bound. No air flow yet the AC is running constantly. The hot air will melt water from the block of ice on the outside while the cooling fins keep the ice in contact with them frozen. With no place to go, that dripping water can enter the air plenum and drip on you.
My best guesses anyway.
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