Vectorization - Layer Becomes White - May Be Bug. May be, old iPad Mini just not powerful enough

So, I signed up for the subscription for the illutrator on the iPad juts now. Mostly, I am trying to convert my photos and paper based illustrations into vector art, and see if I can enhance them from there.

I have an ageing iPad Mini."2019 Apple iPad Mini with A12 Bionic chip". So, it's pretty old. I am surprised the tablet is still running. 

Now, this is what happens. In all these scenarios, I am creating a new document, and then, loading up one of my photos. I am a photographer, so most of the photos of high quality photos in large size JPG or RAW format from the camera.

1. Sometimes, the vectorization process begins in earnest, takes its own sweet time (5 seconds to 20 seconds), and I get a nice vectorized output. The default output is color and it looks amazing. I am able to change the options and play around no problem. 

1. Other times, many times really, after pressing the button, it just becomes white. and it remains there no matter what. 

1. Once it becomes stuck at white, does not matter what I do. create new layers and try with new image. same issue. vectorization never happens. (note : all other illustrator features continue to work as normal)

1. I create a new file, same issue. 

1. Occasionally, the app will simply crash. 
1. Occasionally, the 'color' output will be white, but the black and white works, but that also dissapears if I try any other options. 

Ultimately, this is what I found out.

1. Force quitting the app with swip up gesture on the iPad.

1. Give my iPad a bit of a rest, like a few minutes. 

1. Then, it works again (until it crashes or goes white), at which point, I simply restart this solution steps.

I am just putting these notes here for other iPad illustrator users. Ultimately, this might be a bug, and also, the simple fact that my iPad Mini is simply too old to do verctorization. 

Thanks

Jay.