It's purely coincidental to rooting. There's likely a network issue or they're doing maintenance. I know their databases update at midnight our time. I guess that could be related or they may be updating radio firmware on the towers.
From the dialer type *#*#4636#*#* select phone information then look at network type, if it says HSDPA, you're on att's "4g". If they don't have the backhaul implemented in your area yet, it's just gonna be fast 3g like 2.5-3.5 dn and 1.2-1.5 up
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