Public Service Anouncement. Comcast Gateway WiFi Issue.
After a thorough investigation I found that Comcast customers with a gateway (Modem, Phone, router and wireless all in one) model TG862G for sure (other models may be involved). This gateway has issues with several wireless cards. Initially it was thought that issues were only with Ralink WiFi cards however problems have come up with Mac Book Pro and Samsung Galaxy S4 among others. The issue didn't exist initially but after an automated firmware "upgrade" from Comcast the problems appeared. The two solution Comcast has is to replace you Gateway for another gateway (DO NOT TAKE THIS ONE, same problem will come back); the second is to replace the gateway for a plain modem or EMTA ( modem with telephone service). Since Comcast doesn't offer wireless routers anymore any way you have to buy your own (I recommend this route since you control the type of router you will use). Love it of Hate it this is the reality. Good luck guys!