I was not an employee so this could not be really accurate but, I would say:

- There was way too much bureaucracy.

- Software, security, design choices were decided by some kind of committee that didn't have sufficient expertise.

- Competition between teams.

- They wanted to do scrum, without knowing how to do it.

I think their actual expertise was focused on hardware design and manufacture (they build and assemble most of their hardware components in their own factory), and probably firmware devevelopment.