NTOP unresponsive high CPU utilization

Hello,

I'm running the 2.2 release.  I have tested this on 2 firewalls, NTOP seems to work fine at low network utilization, but once it reaches a few megabits it freaks out.  I can't connect to it anymore and it starts using all of the available CPU.  Even once the network utilization drops off NTOP is still unresponsive and continues to run at full CPU for what seems to be indefinitely.  I have let it run for hours and it keeps going.  Restarting NTOP seems to clear it up temporarily.  Initially I thought my slow box might have caused it, but I tested it on a P4 with the same results.  Has anyone else experienced this?  Any clues to what might be causing it?

Thanks,
Chris