hi satscan,
thank you for your answer and your important hints. Best hint for me is where I cant fint a log file in case of an error..... real great!!!
Yes the "General" setting for "LCD power off when AC plugged in (min)"? Is set to "On" (always on).
My first setting of the WLAN router was DHCP and 802.11g/802.11b mode.
With this settings the ipronto has often lost the connection to the internet (during the night or after a couple of hours) .Only a reboot solves this problem.
I changed this settings now to fixed IP adress and 802.11b mode only. With this settings it worked now for a couple of days!!!
Hopefully it run now for the next months, years.....
thank you again............