I have an SX2000 that has a P2P DS1 that fails almost every morning at switchover time(redundant planes). The PRI in the same cabinet is 100% stable. To clear, sometime I reload the card, sometimes I reset the CSU, other times both. There are two circuits on the same card, the failure is random. Sometimes one DS1 (or the other), or both - no pattern. Next step is to swap the formatter I card, but has anyone encountered anything similar? Thanks in advance.