What I believe is happening to your machine is your GPU is de-soldering itself from the Logic Board causing the green lines in your video. My guess is you will eventually lose video all together or have the green and pink lines permanently.
Since lead solder has been banned, lead-free solder tends to crystallize and crack over time which causes the separation. While gaming and watching videos you put extra stress on the GPU. Also letting the laptop breath is important to keep it cool. Leaving the machine running on a couch or other soft surface causes it to overheat which is the biggest cause of the GPU failure.
We see it all the time most commonly in the HP DV series of laptops.
You need a high quality re-flow/re-work station to do the repair. We have a service to fix that problem for $69.95 if interested.