I installed Avast Mobile Security on a new Samsung Galaxy J5 (2016) and then installed a software version and firmware update that the phone offered. After the update installed I noticed a slowing/decrease in performance (not major, but definitely not as good as before).
Is it possible that the Avast App interfered with the firmware update and caused this to happen?
(If yes, I assume the only remedy would be to factory reset the phone and not have Avast installed when installing firmware updates in the future.)