Mouse Sensitivity Changes After a good 5-15 minutes of gameplay

While playing minecraft snapshots (Sidenote, Only in the recent 1.7 Snapshots, 13w36a-Current Snapshot) the mouse sensitivity will be randomly high for no apparent reason. The despite what I have set on the menu (Normally 110%, but I lowered it to 90% with no effect) the mouse sensitivity is just unplayably high for my gaming level.

I'm not sure how to recreate the issue, I will keep looking into it.