I have a MPB 2015 13" MBP with High Sierra. I bought a ViewSonic VP3881 monitor. Monitor works flawless. (Except for a documented feature of sound control access from keyboard not working.)
But for some reason the wifi is being VERY spotty. I've had the monitor for 2 weeks now and I can't find an obvious pattern, except that it looses connection with the wifi on an irregular basis, while at the same time I have an older MacMini 2014 (El Capitain) on the same wifi, that does NOT drop the connection. Sometimes when rebooting it picks up the wifi, sometimes not even after reboot. Unplugging the monitor seem to make the wifi came back every time though.
Why would an external monitor interject with wifi?
This seem like a hardware problem, so I'm more or less forced to accept the situation, but hoping that there might be a checkbox somewhere I need to set to fix it?