No that is not normal at all. Extremely undesirable. In our many trials Trisul runs for weeks / months.
Can you check if the following helps :
1. Go to Customize > Advanced > Options. Change the "Trisul starting mode" parameter from online to onlinerxring. This will use the linux RX_RING mechanism to capture packets instead of the stock libpcap (which is quite inefficient). This will also help capture at high speeds.
If you are interested I offer to send you a free unrestricted license file to you for your help in tracking this down. Type the following and send me the output via email.
<code>
trisul --machineid
</code>
Thanks,
Regards,