Error in time set, SPD8020, FW7.0 and 8.0

Hi Julien, Hi fvdw
I just recognized that my SPD8020's (I have 2) have wrong timestamps.
I use fw7.0 and actually tried fw8.0, same error.
Manual timestamp: error message "could not update field Time and Date (1)"
NTP time set: not working automatically !
My NTP server 129.187.254.32
After setting once to manual and try, setting back to NTP it updates time and date correctly. After power down, error's back again.
Any idea or workaround ?
I just recognized that my SPD8020's (I have 2) have wrong timestamps.
I use fw7.0 and actually tried fw8.0, same error.
Manual timestamp: error message "could not update field Time and Date (1)"
NTP time set: not working automatically !
My NTP server 129.187.254.32
After setting once to manual and try, setting back to NTP it updates time and date correctly. After power down, error's back again.
Any idea or workaround ?