Random crashes (no error screen),makes textfile of errors like "hs_err_pid5464.log" on my desktop every 10mins or so

When i am playing ,i get an odd lag spike half-way through breaking a block and my minecraft crashes without the "Minecraft has crashed" screen or anything.It does however ,make a small textfile on my desktop named "hs_err_pid5464.log" (Often different numbers each time...