mine stops half a dozen or so times a day, for 10 seconds or so at a time, from april 1 through april 15...too much stress, too much caffeine, k-n-o-t enough sleep...irregular heart beat, then silence, feeling of building pressure inside my head, narrowing of field of vision then, boom...it starts beating again...happens a few times and then i lean back in my chair and fall dead ass asleep for 15 or 20 minutes...it's usually working ok again when i wake up.