Wlan doesn't reconnect automatically

wlan0 works via gui setup btw.

First I'd be happy to properly set up wlan so I can ifup/ifdown.
The commands 'ifup wlan0' and 'ifdown wlan0' seem to work but I can't ping any server.

/etc/network/interfaces:

allow-hotplug wlan0
iface wlan0 inet static
address 192.168.0.33
netmask 255.255.255.0
gateway 192.168.0.1
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

/etc/wpa_supplicant/wpa_supplicant.conf:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
ssid="myssid"
psk="password123"
}

dmesg still:

brcmfmac: brcmf_add_if: ERROR: netdev: wlan0 already exists
brcmfmac: brcmf_add_if: ignore IF event