Image sprites only loading sometimes

I'm working on a relatively large project and the image sprites are my canvas are having trouble loading in. On the Chromebook app companion everything works just fine, but when I pair with my phone the sprites usually don't load and can't be clicked. However, after refreshing the screen multiple times, they show up and work just fine. Please help!

How many images you uploaded to assets? what's the biggest resolutions of the images?

I have 21 images uploaded as of now. The disappearing images (images on imageSprites) are 1000x400, but it doesn't matter what image is on them. I tried just making the imageSprite picture a black square but it still disappeared.