Very strange sync issues

Hey guys,

I'm going to go into as much detail as possible here..

I edit gaming videos for a living and have been having a bit of a weird issue.

Let me first give a detailed description of what is on the timeline.

1. Facecam: 1080p / 60fps / 48000 Hz - Compressed - Stereo

2. Gameplay: 1080p / 60fps / 48000 Hz - Compressed - Stereo

3. Microphone Audio: 44100Hz - 16 Bit - Stereo

The Facecam and Gameplay stay in sync.. but within maybe as little as 3 minutes, the microphone audio goes out of sync. So I waste time having to go up and down the timeline cutting and moving the mic audio to get back into sync.

Now the obvious thing here is that the Mic is at 44100 and the rest is at 48000. I've tried handbraking the mic audio to 48000 but it makes no difference.

Here's the odd bit.. I also record my own gaming footage (basically the same as the content I edit for a living).. here's my timeline..

1. Facecam: 720p / 59.94fps / 48000 Hz - Compressed - Stereo

2. Gameplay: 2580x1080 / 59.97fps / 48000 Hz - Compressed - Stereo

3. Microphone Audio: 44100Hz - 16 Bit - Stereo

However, this stays in sync and I have no issues.

I literally am out of ideas here.. so I thought I'd see if anyone could suggest any theories to fix this problem.

Many thanks in advance!

Ben