RX Packet Overflow

I’ve had a couple RouterBoards used for basic in-home internet access over the past 14 months or so.

I was looking at the ethernet statistics for one of my routers handling my cable internet connection and noticed a small number of RX overflows.
I didn’t notice any performance issues, but I’ve had routers up for several months and just in the past week I noticed this one was showing a few overflows. I will keep my eye on it.

My question is - what would cause something like this to happen typically? The router is plugged into a Motorola cable modem. The network is a traditional home network. Just basic NAT and single WAN link.

During the day ethernet port stopped comunicate for about 10s, then he got back fully functioning(withou doing anything). Ethernet was malfunctioning about every 20-30 minutes. I have just find rx overflow in rxstats. It was on rb750g, I had there routeros v 5.6. I upgraded on 5.18. now it seems it works fine.