IPSec tunnel dropping traffic

[hphan082]

hi everyone,
I'm trying to come up with a better description, but that's all I can come up with. Our pfsense is dropping the encrypted traffic inside the tunnel for some really odd reason.
The tunnel is up, however, our customer reporting that their SSH connection from their location to a server behind the pfsense is dropping a lot. I looked and saw the screenshot.
How should I start troubleshooting this?

We are running 2.2.4. I have at least another 20 firewalls running older code. I'll check to see if those see the same symptom.

Hieu