This is the first time I heard Windows phone being called bug-ridden. It was an awesome phone OS. It did not have many apps but the platform was solid. I still miss the way copy and paste worked.
As much as I loved the UX and rooted for the platform, the apps were just bad. Even first-party apps were depressingly crashy.
This was circa Windows Phone 8; maybe it improved with subsequent releases.
From the Wikipedia article I linked:
https://en.wikipedia.org/wiki/Nokia_Lumia_1020#Reported_prob...
Windows Phone has been a very stable platform with stunning UX. The only real problem it had was the developer marketshare.