Hi there.
For us I was starting to get too frustrated what I deemed irrationally angry. Dd was only 6 months old, but the only way she could get to sleep was if we sat next to the cot holding hers arms and legs still. That may take 10 mins or 90, and it might not last more than 20 mins before we (I) would have to start over.
I would say if it's a problem for you, it's a problem.
Good luck, I hope you can find a solution that works for you and dd.