OOS that comes with 1+3T's have some error in the code, after a few days/weeks of use people experience insane battery drains and overheating, just do a factory reset (first with keeping all your data, if doesn't work, do a full wipe).
But since unlocking, rooting, installing a custom recovery and ROM doesn't ruin your warranty, if you have some time on your hands, why not try LOS, RR, or some other ROM? If you don't like them, you can always go back to OOS.