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Don't know how, but it sounds like he used the ad-hoc patch (for nook) found on the XDA developers site. Essentially what it does is allow your nook color to connect to phones using a peer to peer connection (my guess is the program you are using to tether your phone is barnacle- which is ad-hoc only). The bad thing about using the nook ad-hoc patch is exactly your problem. Every time your nook goes to sleep, you lose connection. For the most part, unless you want to factory reset your nook, you are stuck with it. Well not exactly, but to a beginner, the other option would seem out of their league.
Me, I use the ad-hoc patch because my Droid really wasn't meant to be a router. Luckily with programs like Barnacle, I can connect with my nook. I just deal with the pain of resetting the wireless if it goes to sleep.
HIGH HORSE MODE ON
Don't let people mess with your stuff if you are unsure exactly what they are doing. Luckily the guy helped you a bit, but he also voided any warranty on your phone by rooting it. Even if unrooted, they (the man) can see it's been rooted. The whole root process is getting easier all the time (Super One-Click anyone?), but that leaves the uninitiated down a very slippery slope, and they often get stuck at the bottom.
HIGH HORSE MODE OFF
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