Deathadder v2 pro dongle problem

I just got deathadder v2 pro today. The first 5 hours of usage were fine, but then my mouse started disconnecting for about 5 seconds and connecting back. That happened about 4 times in 10 minutes. I installed newest firmware available. When starting the updater it detects the dongle and says that newest version is installed. But the mouse itself doesnt bootup with the dongle. USB works perfectly fine. I tried uninstalling drivers and synapse but that did not help. Also the installer detects wether the dongle is connected, but synapse app doesnt detect the mouse when it is plugged in with the dongle. what do i do?