It was only split screen co-op which caused issues on the Series S.

Sleep has always been a flaky on Windows. When it works it’s just as quick as the SD. However games have a habit of breaking it.

Most Ally owners use hibernate instead. It works much better, but takes a little longer to resume. One big advantage of hibernate is it uses no power when off as the device shuts down. Sleep will deplete the battery over a few days.