I have two servers where out of the blue a few months ago the POA started
sitting at 20-30 Processing. Busy and File Queues would be mostly at zero,
sometimes climbing to two or three.

I also noticed that he Packet Receive Buffers would start gradually climbing
from 2k to 10k over a week or two and then the server would hang and need to
be reset.

NW6.5SP8 (not my decision we haven't switched yet) GW8.0.1HP1 4G ram

Everything is current on patches, Nothing has been changed for months.