Image issues with GTX970

Sometimes, blue spots (or lines or whatever) appear on the image edges. I don’t know what could it be. It isn’t something serious, but may be good to let you know. Oh, and I’m playing at 27151527@19201080, optimal config according GF Experience software. Drivers are 347.88.

PC Specs: i7-4790 3.6, MSI GeForce GTX970 Gaming 4G, 16GB RAM. Oh, the screen is a Samsung S22D390, max 60hz and Full HD. The drivers are the last nVidia released (347.88).