Hi folks, my wife's Galaxy S2 has developed a strange problem. It appears that the headphone output is summing to mono, which is cancelling stuff and making music sound very strange. I've replaced the headphone jack unit (as per the ifixit guide) but the behaviour is still there, which makes me think it's a problem with the main board. Anyone had a similar problem? We've done all the usual troubleshooting with different headphones (with 3 and 4 contact jacks) to no avail, tried different media players etc.