Duo-S does not shutdown

Hi, has anybody found that the Duo-S does not shutdown.
Upon issuing a poweroff cmd or shutdown cmd it does
not halt and then just reboots itself. This is not ideal as
it is in an unsafe condition to turn off the power supply or
remove the sd-card without the risk of SD Card corruption?

does anybody ha a solution to this?

I also a 2xDuo, 2X Duo-256M, these both halt at the shutdown
point correctly

Same problem here. Instead of shutting down it just reboots.