We seem to be having a problem collecting any kind of usage stats on a 6509 with a flexwan and 8 port serial card (V.35) . Router is running 12.2.18SXD3 . We can collect stats from all other interfaces on the box with no problems but cannot on this flexwan and the 8 port serial . We can also collect from a HSSI port adaptor on the same flexwan but cannot collect on the 8 port serial card . We see this on 2 different 6509's . Any ideas what would cause this ???