I have the same problem as well
It breaks on large pdfs (100 pages plus), hasn't worked since version 4.2
Updating the timeout and adding --no-sandbox didn't fix it
I'm assuming the issue is either due ton the chrome update in 4.4 via puppeteer or the refactor in 4.3
However, 4.3 is broken (throws a js error) so it's hard to narrow down which one is the problem.
Unfortunately I can't provide any of the templates / custom code, but it would be great if there's another solution someone found to this.