I've received a user report that, after they had filled out a form and pressed submit, it "died". I don't know whether that means the tab crashed or hung. They reported using Chrome on a Moto G30. The form has two single-line text fields and two multiple-choice questions, no conditionals or anything, so it's rather small and basic.
The form in question: https://cryptpad.fr/form/#/2/form/view/M6-g4pNGJSxuWQKr3mh6Eu5MyxgBB4xixcj2+3YMQzg/
We decided to write it custom and self-host instead of using cryptpad because of this issue, so feel free to test and play around with that form.
Hope this helps in making CryptPad reliable