Hi Guys, I'm a noob in this scene and found this forum to be a great source of advice and support hence joined today. I recently purchased a used Optoma H181X projector which I find to be great for my purposes; however I have noticed a slight issue when watching movies and being on bright areas where I get a flicker for a few seconds every so often. This tends to kick in after about 20-30mins usage and can be seen on the white test screen too. The only time I don't notice it is during dark scenes. Any ideas what could be causing this for me? Help will be appreciated. Ps. The lamp has had about 3000 hours of use. I've cleaned all vents etc, which had been clean when purchased too.