As far as I can tell, whenever this happens, it's due to random traffic on the local LAN confusing SEQ. I have some ideas on how to make this less of an issue, but it may be a while before I can get to them.

For now, I'd recommend turning on Session Tracking under the Network menu and see if that helps.

Also, the OP_ZoneEntry warning has been like that for a while IIRC. I don't think it's hurting much, but I'll try to take a look at it.