TBH a question without answer, it's been years since I Had a Skybox, was heavily involved with a support forum then.This question was asked countless times. It doesn't seem to harm the box, it clears with a reboot , or pressing tv/stb button. As to what it is or why it happens. Maybe a firmware issue, remember you use modified firmwares on these boxes, boxes which are made all over China,by competing companies,anyway less waffle bottom line box is fine, which is all that counts really