I have a problem I just can't solve.

Running TS3 on

MacBook Pro (Retina, 15-inch, Mid 2015)
El Capitan - 10.11.6
Processor: 2.8 GHz Intel Core i7
Memory: 16 GB 1600 MHz DDR3
Intel Iris Pro 1536 MB

TS3 version 3.1.8

I am experiencing 10% - 50% incoming packet loss. And I have no idea why. I'm running on a wiFi system, hi-speed Verizon FIOS. Proximity to makes no difference. Same results whether I am right next to it or in another room. I've adjusted my MTU setting manually to 1400 but no help. Any suggestions? My EVE ONLINE gameplay is impossible for fleets and operations. And oddly, it's only INCOMING.... Outgoing is fine.