C5 ULTRA DUAL bluetooth disconnections

[nilp0inter]

Hi, i am experiencing connection problems with my c5 ultra dual.
The device connects without any issues with all my bluetooth devices but from time to time it gets disconnected from all of them: smartwatch, car stereo, headphones. This makes the device unusable with bluetooth devices.

I found some people with the exact same issue here :http://forum.xda-developers.com/xperia-c5-ultra/help/bluetooth-problems-t3263157

[Jake-SonyXperia]

Hi nilp0inter,

Are you using any kind of Anti virus or Battery performance applications or apps in the like?

[Uliwooly]

@nilp0inter

does this happen with an specific app or apps?

[nilp0inter]

I don't have any Antivirus app nor battery saver.

[nilp0inter]

It happens at random times no matter the app I'm using. In my car it happens even during phone calls.
The distance from devices is also very close, less than 1 meter.

I first saw this behavior when the first day i used the phone, with factory settings.

[YoGem]

Look, I use a SWR10 that disconnect also at 10 centimeters from the device, the Moto 360 doesn't, the SmartWatch 2 was disconnecting too but less than the SWR10. It's all about protocols, Bluetooth 4.0 disconnect really less than 3.0. What kind of devices are disconnecting, how many and what protocols?