are rejected the same as stale shares?

the lines show up at normal settings and when underclocked or overclocked. they seem to just show up when the card is at high usage nonstop for a few hours.

These lines show up even when the card is running at 60c overnight and memory is underclocked to 300.

When I run my 5870 even at stock settings overnight a few random red/green lines start flickering on the screen. They go away after a few mins of turning the miner off. Is this normal or is the card bad?