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Your sure it's the discharge line?

Is the bigger insulated line freezing? or the smaller un-insulated line?

If it is indeed your smaller discharge line sounds like you have a restriction somewhere causing the freon to flash off.

If it's your suction line, it could be a variety of things from a dirty filter to improper freon charge.

You need to give alot more information for the hvac guys on here to give you a proper guess.
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