Pfsense WAN stops working after sustained downloads

After downloading for a while (~50GB or so, but it varies) on my 1gbps internet, I lose internet access through pfsense appliance. I do not have the same problem if I bypass the firewall and connect directly to my modem.

Pfsense version: 2.4.5-RELEASE-p1 (amd64)
Hardware: QOTOM box with intel I211-AT NIC, i3-4010U CPU, 8GB RAM.

I’ve tried a couple things I’ve seen suggested for similar problems (kern.ipc.nmbclusters=1000000 and hw.igb.num_queues=1 in /boot/loader.conf.local) but no change. I can access the pfsense box fine through the web interface from the LAN side, but no internet access, either from devices going across it from the LAN or from the box itself (ping command in the webGUI).

Looking in logs through the webGUI, the only things that come up at the time it goes down are in Status>System Logs>System>Gateways, and are the following:

|Jan 31 16:59:17|dpinger||WAN_DHCP 24.36.32.1: Alarm latency 0us stddev 0us loss 100%|
|Jan 31 16:59:15|dpinger||send_interval 500ms loss_interval 2000ms time_period 60000ms report_interval 0ms data_len 1 alert_interval 1000ms latency_alarm 500ms loss_alarm 20% dest_addr 24.36.32.1 bind_addr 24.36.32.xxx identifier "WAN_DHCP "|
|Jan 31 16:59:14|dpinger||send_interval 500ms loss_interval 2000ms time_period 60000ms report_interval 0ms data_len 1 alert_interval 1000ms latency_alarm 500ms loss_alarm 20% dest_addr 24.36.32.1 bind_addr 24.36.32.xxx identifier "WAN_DHCP "|

Rebooting the box brings it back up, but it will consistent and repeatably go down again under load.

I’m a pretty big FreeBSD/pfsense noob so you might need to hold my hand a little more than average, but I’ve poked and prodded at systems before so I know a little.

Any suggestions would be wonderful!

You need to add rules to allow traffic from wan to lan and vice versa. There is a checkbox at the bottom to allow private IPs on the WAN side, if you are using DHCP on router on WAN side.

Check DHCP Lease Time on Router, best to put router in bridged mode to eliminate any disconnects.

If there is a power save setting somewhere?

I am using DHCP with the firewall, I do not have a separate router on the network. Modem is bridged, no router enabled there.

I haven’t found a power save setting that is enabled, I do not believe that is causing a problem.

Thanks for the suggestions, though!