defender sucks
The beta version did. That was toseed in a day! The full version so far has been non intrusive.
Nothing is running... I use my Mac a bit more than the others and it doesn't have a single security program that could block it.... I barely have any security on my computers except Windows Firewall on my two Windows.
Besides security like the Windows Firewall how about the ISP firewall as the thing to look at if you are running off of a dls or cable router. Another idea to would be to look at the items that are loading by default along with Windows in case something there is the cause. You could use the msconfig utility to temporarily disable all startup items.