I enabled SmartFlex on my n900 running PR1.0 last night. About a few hours later (4-5 or so not sure exact times) the phone rebooted while I was reading a book in FBReader. I have not (knowingly) experienced any 32wd_to reboots (or others) on this device. Enabled it again at the time of this post and will report if I get another reboot.