After setup the nice astroberry image and fine tuning of the system i recognised  temporarily WLAN loss in a regular base.
Looking in the log files I got no explanations for this effect.
Searching in the web i found some information that the COUNTRY=PL setting could be the problem.

So I changed the COUNTRY language setting to DE which was set also in mein raspi-config settings.
After this was done the nasty temporarily WLAN loss incidences stopped.

I used the following commands :

sudo find / -name wpa_supplicant.conf
sudo nano /etc/dbus-1/system.d/wpa_supplicant.conf
sudo nano /usr/share/doc/wpasupplicant/examples/wpa_supplicant.conf

ps -f -p $(pgrep wpa_supplicant)
UID        PID  PPID  C STIME TTY          TIME CMD
root       496     1  0 09:13 ?        00:00:00 /sbin/wpa_supplicant -u -s -O /run/wpa_supplicant

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf.bak
 

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