Recently I've been having trouble with the screen of my Artist 12 Pro. It flickers every second or two, the screen is shaky, there are horizontal lines on the screen and are pixels that flickers from time to time. I've already made sure that all the wires are already plugged in properly and the driver is working fine. My tablet worked fine prior to this and I only got this tablet less than 2 weeks ago. Any advice would be great, thanks!