There's no fix yet, but Nexus One users are getting a solid first step this week now that T-Mobile is officially investigating the 3G / EDGE fluctuation issues that folks have been reporting. A posting over on T-Mob's official support forums is now asking for users with verifiable problems to report a few key stats including their location, the nature of the problem (no 3G or 3G / EDGE switching), and whether they've got another AWS 3G phone handy that's performing better. The company says that it hopes "to have more information for you soon," so, you know, keep that box handy just i