grub issue

[michael miller]

I was happy with ubuntu 10.04, but built a new computer (intel i5, msi
mb) and was having trouble finding drivers for some of the hardware so I
upgraded to 12.04.  Everything works fine, except that frequently it
boots to a command line instead of the gui.  One to three reboots later
it's back to normal.  I thought it would be a grub issue but haven't
changed anything since the original install and particularly don't
understand why the problem is intermittent.  Any suggestions where I
should look?

Mike