Emulator

What's the problem?
Constant noise occurs after a playing for awhile regardless if Audio Throttling is on or off. Sometimes it runs fine for up to 15 minutes.

Dolphin version with the problem (as it appears in the title bar, Ex.: "R
4779" or "R 6403M"):
R6801

(optional) Dolphin version that does not have the problem:
Always had this problem.

Operating system and version:
32-bit or 64-bit:
W7 64bit

Game ID (as it appears in game properties, Ex.: "GZ2P01" or "RSBE01"):
SX4J01 - Xenoblades

Build command-line (not on Windows):

Was the ISO a plain dump from disc, compressed and/or scrubbed?
plain dump

Please provide any additional information below.
Problem does not seem to occur when Enable Idle Skipping is disabled. (need to test more as i couldn't stand playing with it disabled for too long due to low FPS)
Tried lots of different settings, same problem.
Otherwise, game's almost perfect.
Specs are PhenomII x4 B55@3.8Ghz, 4GB 1600Mhz DDR3, Radeon HD5870.
Both Dolphin, OS and ISO are stored in a Intel SSD drive.