so.... i tried some things to fix this issue
•Reset All Settings in settings app > didn't work, i just got all my passwords and apps setup messed up;
•Downgraded to 16.0.3 > my latest backup was in 16.1, so i couldn't restore a 16.0.3 phone using a 16.1 backup. its my main device, so i don't have the privilege and time to organize and download everything again using the old version;
•Reinstalled the 16.1 and restored it using my latest backup > i'll try this fresh reinstall of iOS and see if it helps.