Highly unlikely. power regulator inside N900 works in a way, that would result in shutting down whole device (in a "bad", unmanaged way) in case of too long low voltage peak), not any software "hanging". Also, I don't think you had BME disabled - with BME working, device would shut down ("good" way, i.e. quasi-proper shutdown) mu(uuu)ch before any chance for low voltage spike, that would shut device down "bad" way. Device "dies" of low power @ ~2850 mV. BME shut it down ~3200 mV (no hard treeshold, as it's monitoring momentary peaks, as opposed to average voltage for given second). /Estel