Reply from ledger publicly admitting they have a problem, claiming that 5% of their devices have battery problem, but I suspect it's much more than that:
It's hard to trust Ledger when it comes to figures they make publicly available. The number is surely above 5%. The only question is how big is it? But you need to also take into account that only unsatisfied customers complain about a product. Those who have no problems, won't open a reddit thread saying everything is OK. That's just the way it is. For every unsatisfied user, there might be 10 who are happy with what they got. However, there might also be another 10 people with problems that haven't been addressed in public. We will never know the exact numbers.