XPS 15Z Bluetooth dilemma!!!

XPS 15Z Bluetooth dilemma!!!

I am having some weird problems with Bluetooth; it appears and disappears from device manager and tray. If left overnight and turn it on in the morning the Bluetooth, in fact the system finds it and installs some of its components and works fine.
If I restart it the Bluetooth is gone completely, no way to find it, in Device Manager or tray, only in control panel -> uninstall programs-> Bluetooth software.
I installed/uninstalled all kind of drivers, new and old, the same thing. Checked the Services, all Bluetooth services are active.
I have N-6235 wireless card built in Bluetooth 4.0. It worked perfectly with previous motherboard, but I have this problems since has been replaced with refurbished one for no reason.
Personally I have not a clue. Could be the motherboard.
I also notice that is I disconnect the battery and the wireless card , than put them back, restart the system, the Bluetooth works fine till next restart when goes away again.
Anyone had this problems?





Bluetooth is gone after restart

 

Does the Bluetooth just disappear, or does it also stop completely working?

If it's the former, check this: Windows 7 Bluetooth Disappears

 

Disappears and stops completely working.
Start->search-> Bluetooth file transfer is the only thing found as Bluetooth, but is not working.
I am running Windows 7.

 

Fixed it. Replaced the motherboard (I guided the engineer how to do it, as usually) and everything is OK.
It behaved strangely, after a few hours of use, idle temps use to go up to 70-80 degrees....restarting the only option left….
This one seems to be working as should be. Temps are ok, Bluetooth is working fine.