oil separator symptoms

[rock1571]

I had my dealer replace the OS, hoses and dipstick tube last January when it all froze up and blew out the valve cover gasket. Would it be unusual to have a problem again this year even though I've gotten new parts installed? Last weekend she had some rough idle early in the morning after the vehicle sat out overnight. I checked the dipstick and under the oil cap and there was a small amount of the teltale milky oil. I'm wondering if I need to replace the OS again or can I just take it apart and clean it out? Would cleaning it out just delay the inevitable?