Where is the Reliabitity ? Losing users to BlueBuild?

I’ve been a Linux enthusiast for a long time, and I’ve been using NixOS daily on several machines for around five months. At first I loved it, but now I’m constantly bothered by stability issues. My lock screen froze, text in Thunderbird and Firefox simply disappeared, AI-agent plugins crashed, cloud platform apps crashed, etc. What I love about NixOS is the incredibly easy reproducibility. I need a program, I add it to my configuration, rebuild, and pouf, all my computers can have it. I reall...