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Cisco ASR1006 high cpu usage

Hi all first time posting here forgive me if i posted in the wrong section   i have a problem with one of my ASR routers in a production environment, we are observing irregular cpu process percentages and response time on ssh terminal is quite slow.  It is quite a busy router with at least 3 major aggregation links pushing average 300M each (all gig ports).  here is an output of show proc cpu sort command.  seeing that there is high asr1000-rp-punt, this is an issue on the switching type on the router?  how can i bring this down?  we do have dynamic NAT running as well on this router for about 2000 customers (though not all connected at the same time) as well as a few route-maps

this is the ios we are on


Also have noted that this router has had software crashes"

Last reload reason: Critical software exception, check bootflash:crashinfo_RP_00_00_20140220-082209-UTC

PU utilization for five seconds: 18%/13%; one minute: 26%; five minutes: 26%

PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process

  77     3675167      796593       4613  4.17%  6.02%  7.47%   0 ASR1000-RP Punt 

  58      141108      203647        692  0.26%  0.33%  0.35%   0 IOSD ipc task   

CPU utilization for five seconds: 0%/68%; one minute: 29%; five minutes: 27%

PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process

  77     3689419      799389       4615 28.25% 11.86%  8.03%   0 ASR1000-RP Punt 

any suggestion on what i can look at would be very welcome

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