Batch convert images to PDF

I have tried to create a   "Batch Convert Images to PDF" task.

It looks like it is running fine, however, each time, somewhere after 80-90 files have been converted Acrobat crashes.

I have no idea why.

There are a few threads on Internet about converting images to pdf, but regretfully none of them I could use.

Either they were for some older versions of Acrobat (steps do not correspond with my version), or the answer was vague/unclear to me.

I am using Acrobat XI Pro on Windows 10.

Have tried to create a task as per below.

Three questions:

a) how to have the task run minimized (if at all possible)?

b) how come Acrobat gives up, after say 80 or 90 files?

or

c) is this task/sequence, the way I set it up,  wrong ?

I am sorry if the screenshots are too big!!

Have no idea how to upload them as a small image.

Thanks!