Ever since about 3 days ago my Minecraft starts randomly freezing?

Yeah my computer has 4GB of ram, and when I play after a couple of min the game will freeze, then say not responding, and then I have to close it and restart but it happens again. I have the fully paid for game but this just randomly started happening about 3-4 days ago.

Ok… Uhn… Did you add any mods to your minecraft and if so. Did it have any errors

If you have minecraft 1.7.2.well it happens to my1.7.2 also bbecause they haven't fixed all of the new bugs yet!

If you aren't using 1.7.2 then check your pc for viruses

Btw when adding a mod. Try using magic launcher?

Try re-downloading Minecraft from Minecraft.net.