wlan disappears on rum0

[Christoph Kukulies]

I start an

ifconfig rum0 inet 10.0.0.1/24 mediaopt hostap ssid MySID wepmode on 
wepkey 0x01020304050607080910111213 weptxkey 1 channel 1

and it seems that after a day or a night the wlan is gone. No SSID is 
being seen in the air.
I then manually start it again and the wlan is up again.

I have no idea right now when it disappears or why.

Could it be that some nightly periodic is causing this?

--
Christoph Kukulies