monitor changes color frequently

usually if the monitor color changes there is something broken in it, which I know you have bad optical colors and must be replaced

Well it could also mean your monitor meet its lifespan , time to buy a new monitor yea .

i think thats problems is radiation from pull of magnetism on your compi if is thats..you can use the magnet too for attract those colour to comeback.. i hope this can help you..

Check the cables. The video plug probably isn't in correctly, and the moving of that cable can cause the colors to change. If its plugged in correctly and it still doesn't work, then maybe there's something wrong with the video cable. Possibly, you should buy a new one if this keeps happening. The reason behind it being red, blue, and green is that those are the three shades that most pixel colors are. Also, be sure to check your monitor's preferences. See the RGB (Red Green Blue) scale and try to balance them out to your pleasing. Hope this helps. :)