I have a on Roku projector. I turned it on one day and there was a big black spot just one in the middle of the stream it's about the size of a basketball. I want to know what it is is it fixable and how do I keep it from occurring again
Do you mean the brand ONN? If so, you need to contact them. Roku just supplies the software ONN uses. But then, what do you expect from a Walmart house brand?
Projectors from several manufacturers have been sold as a bundle along with a Roku stick, but I don't know if they've been sold as "Roku Projectors".
Do you have any other inputs connected to this projector? If so, do they exhibit the same "black basketball"? If you plug the Roku stick into a regular tv, is the spot still there?
I suspect this is a hardware problem that you'd have to refer to the manufacturer of the projector.