Occasionally my monitor develops annoying flickering horizontal bars which seem to be affected depending what's on the screen, for example scrolling down to another part of a website may make it better or worse, but ATM it's across the very top of the screen. The bars are usually a pixel wide from what I can tell, but there can be more than one at the same time.

I'm fairly sure it's not a GPU problem as I have two PCs connected and it happens with both; one through DVI, the other through DP.

Unfortunately I've had it over a year now so I probably can't file an RMA (Dell monitor bought from Aria, I'd be happy to be proved wrong) and it's intermittent and not always obvious so there's a chance it could end up 'no fault found' anyway.

Any idea if there's anything that could be causing it/any solutions? It's barely a year old and it's otherwise a great monitor so I'd rather not have to replace it.