The power supply on one of my Creators has suddenly, over the past two or three days, started making a louder and louder humming noise. This is actually my newer Creator, but both of them run 10-12 hours a day. I think I saw a thread about this issue some time ago but I can't find it right now. Does anyone know what could be causing this? Perhaps a sign the power supply is about to give out? Thus far there haven't been any problems with prints, just the annoying loud noise.