I can confirm having the same issue, including on multiple raspberry pi 3s, one with an IPv6 tunnel from tunnelbroker.net, and one without. It can be triggered by a lot of IPv4 traffic for me as well.
I can confirm having the same issue, including on multiple raspberry pi 3s, one with an IPv6 tunnel from tunnelbroker.net, and one without. It can be triggered by a lot of IPv4 traffic for me as well.