I have, it's a known issue, but does not happen to everybody. On stock nooks few people have reported this problem, but on rooted nooks this seems to happen to much more people. For me I really noticed it after I rooted my device. Is your nook rooted?
After I rooted my device my nook would reboot every 1-2 days.
When I moved to nookie(Froyo) it would happen every 2-3 days.
However now that I'm on CM7(Gingerbread) I've not seen the problem.
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