Husband and Wife

I am having connection issues when playing along side with my wife. She is playing on a Mac and has no issues. I have no issues when playing by myself. When we play together, I keep getting dropped and sometimes it takes 5+ minutes to get logged in, just to be dropped a few minutes later. The last round of this was on Friday night. Is this something on my end and I need to adjust router settings? I've read that I don't need to whitelist the IP for two accounts, so I'm just wondering what the next steps are. Thanks.