Not visible after disconnection

Question

Something did change in the last 2 days but I dont know what. 
 On tuesday I was able to connect with my mobile device to the nRF51-DK. The application worked fine and it was always possible to disconnect and to connect again. 
 But since yesterday I`m able to connect the first time and use my application, but when I disconnect the nRF51 DK is not visible anymore for my mobile device. I have to plug out and plug in the supply if I want to connect again with my nRF51 DK. I could also press the Reset Button but thats the same.... 
 Why is the nRF51-DK not visible anymore after disconnection? Because I didnt change anything the past 2 days.

Asbjørn · Accepted Answer

I don't know what application you are using or developing, but it sounds like something has changed upon the DISCONNECT event. If implemented, you should when DISCONNECT occurs, start to advertise again and that is not happening. Even though you set it to advertise forever, it will leave this state if you connect to it and then you have to re-initiate that state when DISCONNECT happens.