THANK YOU VERY, VERY MUCH for your work!!!
I flashed 3.0 with full wipe, but the 5ghz-WiFi-Standy-Bug still exists.
Then I flahed 4.0 dirty und the 5ghz-WiFi-Standby-Bug is fixed.
So far 4.0 runs perfect without problems (S7 G930F)
thank you all.
i have solved the problem.
I flashed the newest stock rom from sammobile with odin. But only "BL", "AP" and "CP".
The Phone booted, but the flow was very buggy and slow with popups.
But the rescue was sucessfull :)