Yes , I have the same problem. Sapphiren stable. Some apps (X, Reddit, Youtube) stutter while scrolling. Also scroll speed is slower as well. Other then that, I feel device is little bit slower at opening apps and sometimes I feel touch delay, maybe 0.3sec. Battery life is better tho.
Is it possible to reinstall rom thru fastboot. Same as updating but with the same rom.
Can this help? (referring to fastboot flashing with install_upgrade.bat)