After getting my N900 replaced last weekend (http://talk.maemo.org/showpost.php?p...&postcount=331) I've now had over 7 days without a reboot or any other problem. I've been following the bugzilla reports for bug 6334, and it seems like some people have found a work around by adjusting the power management options in the Maemo kernel. Based on my own experience, I remain convinced that this is a hardware (i.e poor QA) rather than software problem. This is re-inforced by the fact that lots of other things on my replacement seem to work 'better' than on the first one I had. YMMV, of course, as they used to say on Usenet...