I hope someone can come up with a solution for you.
I also switched from Marvin Classic to Marvin 3. Currently, I only have 125 books in my library but, in Classic, I had about as many as you did and had no crash issues.
Currently, I read mostly on my iPhone X and the only issue I've come up with so far is with the cutout at the top of the screen but it does't stop me from reading my books.
HHuummm, you aren't running out of storage on your device are you?
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