one second network pauses on router

I have a powerrouter 732 that drops packets randomly over one asecond time period. When pinging the router, I would set the ping interval to 10 ms and get nearly 100 packets lost, meaning almost a one second pause exactly. Sometimes it would be as low as 93, but never more packets lost than 100. The swtich that feeds the router responds with no packet loss. I tried changing the port on the switch that feeds the router, and I also tried another cable, neither of which worked. What’s funny is that when I add an IP to another port on the router and ping that IP, I get no drops.

At first I thought it might have something to do with the leap second that occured on the 30th of June because of the length of the drops, but I either don’t understand the problem well enough to figure out how the two are related or it is unrelated. I’m leaning towards it not being related. I swapped the powerrouter with an RB1100AHX2 just to rule out the possibility of a faulty router and nothing has changed. I then tried swapping out the switch, which didn’t fix anything either. What’s really weird is if you run a packet sniffer, you can still see packets passing through the router during the drops, but it is significantly less. I will see traffic jump from about 250 mbps at night to around 30-40 mbps during that second and then it will jump back up to 250 mbps one second later. I’ve done everything I can think of, so now I’m reaching out to see if anyone else has seen anything similar.

I have tried different firmware also (all the way back to v4). Anyone think they might know what’s going on? I have also tried pinging the router from multiple devices, and at different points on the network. All of them show the same behavior. The only thing I haven’t tried is pinging from multiple locations at the same time to see if the behavior occurs at the same time at different locations on the network.

Try it with a new blank configuration (IP Address only) to make sure none of your rules are causing this.