I'm having really strange issues with stability. For a while I was having really bad memory management where I couldn't use more than one app at a time (at the worst point even one app was crashing) even home would crash. Now I get GPU problems. The phone starts lagging really bad, especially during games, and locks up completely. Then says system UI crashed and goes back to normal. Sometimes I fix this by triggering a system UI restart, but sometimes even that doesn't work and instead makes my phone reboot.
I want to move to PD13 but the lack of customization (mainly status bar) is the reason I went back to PD12. I don't think PD13 is more stable anyway.