Beaglebone Black REVC WLAN works only after connecting eth0 shortly


I just have the problem, that my wlan connection
is only working, when I plug in the eth0 connecting.

I tried it with the lateast image of the debian version.

After once, I have a connection, everything is fine,
it works even when I disconnect the eth0.

Logfile in dmesg says, that the “usb power is suspened” after boot

I already have tried all updates, but still have this behavoiur
and need help.

Best regards