I'm getting red artifacts/noise in my digitized analogue (component) footage. Also getting purple/magenta artifacts/noise in my HDSDI captures. They only appear on recent captured footage, all of my previous projects and files are fine.

Is my card going bad? Does anyone know what's causing this?

DS 7.6 (QFE5)

Maybe you need to describe and/or find out what has changed in your System Environment since you have these issues first!

I do not think that your card "goes bad" from one day to the next...

Of course a card can go bad from one day to the next.  I would start by re-seating the boards and cables.

 Thanks for the calm reply :)  I'll give that a shot.