Lor_M182 - I am yet to install 2.5.5 on my Phone (1). I run Phone (2) as my primary and P1 as my secondary device.
That being said, I haven’t had any issues with stability with any update to P1. Others may encounter issues, this is bound to happen, everyone experiences devices differently.
If anyone does have issues, following: Settings > System> Feedback. Is the best way to make your voice heard.