Emulator

What's the problem?

During a game, the wiimotes keeps connected for some random times (sometimes it takes some seconds sometimes it takes osme minutes), the wiimote emulation is completly out of synch (IR Pointer laggy, Uncorrect accelerations,...)
Using an old version and the same wiimotes, everything runs smoothly...

Dolphin version with the problem (as it appears in the title bar, Ex.: "R
4779" or "R 6403M"): Dolphin r7435

(optional) Dolphin version that does not have the problem: the prety old "Dolphin SVN R 6668"

Operating system and version:
32-bit or 64-bit: Win7 Home premium x64 (using Dolphin's x64 builds)

Game ID (as it appears in game properties, Ex.: "GZ2P01" or "RSBE01"):

(Tried 5 games so I think it's any game)

Build command-line (not on Windows): I use Windows 7 home premium

Was the ISO a plain dump from disc, compressed and/or scrubbed?
All my backups are ISO.

Please provide any additional information below.
Wiimotes used are Bigben's without motion plus. (I have 2 wii motion plus add-ons but didn't used them yet with newest build)