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I am going to go with a more basic guess...
Your throttle suctioning mechanism... sometimes the Txvalve...but in more complicated systems ( than my type One ) it may have other components...
is not cutting off the cooling of the evaporator at a high enough temperature... thus below freezing fins on the evaporator are freezing the moisture in the air on the fins.... and cutting off the cold air... until you leave it to melt off and start over....
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