after doing some more digging, and taking my MBP to other networks... i decided to tear into my network at home.
For me, I recently switched to Comcast because of a move, they inadvertently gave me a wireless router/modem without telling me. So I was actually using 2 gateways at the same time (my personal one for wireless, and the one they gave me that I thought was just the modem). Long story short, I re-did the network myself with just the one modem/gateway from comcast and I am having absolutely NO ISSUES, after re-setting the security which the tech somehow setup without giving me any info on how to connect to it (as i was moving in when he installed).
I specifically told them that I had my own router, and that is even what the tech clarified when he installed, asking "you got your own wireless router, right?" But he still gave me a gateway, secured it, and just expected me to make it work??? ugh, so, there ya have it... take it for what it's worth, tech installers don't know jack about customer service. I guess it is a good thing I care enough to investigate and Do It Myself (DIM? 😀 )