Did you flash the recommended firmware? What error is it spamming?
I have tons of custom settings: it'll take me a week to remember them all, and a month to set them back again. I don't have that time (and upgrading Android is nothing like upgrading an iOS - smooth) .
OP3's notification slider is outright broken in stock CM/LOS and the most useful Xposed module to fix this (Custom Slider) doesn't work on LOS and isn't developed any longer.
/* * Your warranty is... still valid? * * I am not responsible for bricked devices, dead SD cards, * thermonuclear war, or you getting fired because the alarm app failed. Please * do some research if you have any concerns about features included in this ROM * before flashing it! YOU are choosing to make these modifications, and if * you point the finger at me for messing up your device, I will laugh at you. * */