what did you cahnge to make the 1st two nodes stop droppin out? have you OTDR the glass? check your pigtails and rreburn if needed... are you just firing them up or are they pre-existing? from what your stating i assume they are new. funny as it sounds i had a bad line terminator make this happen to me, but it was only 1 node not multis... double check your cards in the head end. not sure what equipment you are using either.... also check any splice enclosures between good and bad nodes if they are off the same fiber run....
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