Please put code/tracebacks in code blocks (by wrapping them in ```). That way, it's easier to look through them and they will also become scrollable, saving screen real estate.
It's becoming more and more clear that this is perhaps less of a Prodigy issue and more of a spaCy/Pytorch issue. One question, a span of size 96 feels very large. Are you using a custom config? Your previous commands suggested that you weren't and the standard config has these span sizes:
[components.spancat.suggester]
@misc = "spacy.ngram_suggester.v1"
sizes = [1,2,3]
Is there a reason why your span size really needs to be that big?