Hi,
I also have/had this problem, I "resolved" the issue after a huge amount of fiddling with router settings and other network tweaks (all to no avail) by just refreshing the connection multiple times!! It seems for my home network, it needs about 10 tries to break through and connect, once connected it stays connected but I cannot reliably connect without doing multiple connects.
Not sure if that is helpful, but did want to add my name to the list of users whose network connections are flaky and what I do to get past the issue. I would like a solution but for now I am OK with my method.
Regards,
Steve-KC0NGU