The most typical reason is that your Freon charge is low again. You have a leak. Most likely place where a leak will develop is the valves where the system charging equipment attaches.
If the EPA were really concerned about Freon loss they would mandate a better valve design. Something with a more positive shutoff and something that would not deteriorate with age.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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