Hi after hours of trying i have found the option in my phone witch fix the Problem. 
Hardware: 
Amplifi 75 
Android Phone Huawei P8 
  
Problem: 
Only Mediaplayer works 
  
Fix: 
  
Open Bluetooth option from the Amplifi in your Phone and Turn option "Media Audio" in Profies ON 
  
After this all Problems are gone 
  
Hope it will Help you too