Default [BUG] WLAN i9100

Dear Team,

maybe that i am getting wrong and it should be a feature but since several nightlys WLAN could not be reactived. The Donout is just spinning.
When the Device was rebooted, WLAN comes up smoothly till it will switched off due power efficiency mode.
If i wake up my device, WLAN is of and can not be reactivated till next reboot. very efficiently...

Any hints regarding (my) issue?

BR,
Josh