[c-nsp] BGP Router process - high cpu

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Hi Guys,  High cpu from BGP router process started ~48 hours ago - Happens every 30 seconds (Cisco 7200, NPE-G2...."normal" load is 45->50% cpu)  #sh processes cpu sorted 
CPU utilization for five seconds: 86%/44%; one minute: 53%; five minutes: 50%
 PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process 
 289    20754676  99918606        207 35.12%  6.76%  5.68%   0 BGP Router          All peering sessions on the 7200 have uptime of years(Or many weeks), but I think it has to be due to a re-convergence?  Have the following configured under "address-family vpnv4" (This conf has always been on the 7200(years))...but the 30 second scan time matches the CPU spikes.    bgp scan-time import 10
  bgp scan-time 30  Any suggestions on how to track down the cause?  Cheers.