What looked to be a point very still in sky

What looked like a stationary point of white in the sky seemed to disappear and re-appear from site. How ever it was so small in view it’s hard for our eyes to focus on it even just seeing it seconds before. Originally I thought a single object was moving to slightly different points in the sky. But the last time I saw an object it very much slowly drifted across the sky. By the last time seeing it/them I believe it was a sort of balloon at high altitude. And I feel now thinking about it that there were 3 separate ones that went by during my observation.