Real Wiimote stutters after ~30 mins of playing

[Dinnes]

Hi,
I use Dolphin to play games using a real Wiimote. I've been playing Mario Galaxy 2 and Zelda: TP without too much trouble, except after about 30-60 minutes of playing the pointer starts to stutter. It just disappears for a few seconds, comes back for a few, and leaves again, and it just goes on that way.
To get rid of the problem, I usually have to wait a few minutes and restart everything.

The Wiimote I use is a brandless one which looks exactly the same as a real one, it just lacks branding(the ad I bought it from is here)
I use that in combination with a brandless wireless sensor bar and a Sitecom USB Bluetooth adapter+Toshiba Bluetooth program

Does anyone know how I can fix this? Searching the forums gave me no relevant posts.

My specs:
Motherboard: Asus P7P55d
CPU: Core i7-860@3.5GHz, hyperthreading disabled
RAM: 4GB DDR3
Video card: Powercolor Radeon HD 5850
HDD: Samsung Spinpoint 1TB
Dolphin OS: Windows 7 64-bit


I use the DirectX 9 plugin because the OpenGL slows everything down for me.

EDIT: Forgot to mention this: I use Dolphin 2.0 64bit.