My KLCK (Pro) lockscreen builds stop showing up upon waking the phone (lifting it up etc), after a short period of time. I find that I have to keep the KLCK apk running, and press "save" every so often, just to reactivate it.
SYSTEM INFO: OnePlus 7 Pro 5G (5G isn't, and never will be activated), 8GB RAM, 256GB ROM, Android Oxygen OS 10.0.5, Nova Launcher Pro, 2k Screen Resolution. Using the latest version of KLCK Pro.
More info can be provided.