Every time I put or take stuff from my inventory it wont stay. it literary takes me 3 - 6 times to successively get something in my inventory .

The steps I have taken to try to fix this myself are as follows.
1. Uninstalled , re installed Mine craft.
2. Forced update Minecraft.
3. Updated Java
I know its not my pc or internet connection. I have awesome internet and my pc had 16 gig of ram and I get 150 fps in minecraft.
I have had this isssues since 1.4.2