mobile

I have a Sprint Galaxy Note 4, it's rooted but that it.. NO custom ROM or custom, anything really. Just a Galaxy Note 4 that has root access!

I've had my device for a total for maybe.. 5 months, and it's been rooted since last week.

Since yesterday, all of a sudden my phone is extremely buggy. All of these errors and problems have NEVER occurred before, and now they occur extremely frequently.:

-Scrolling through Gallery app is super jerky, it's like my phone things I'm trying to scroll up and down with 4 fingers on the screen at once. (This has never happened until yesterday)
-Messaging app takes sometimes 6 secconds to load up. (This has never happened until yesterday)
-Phone will sometimes make it to 0% then die, or sometimes die completely when at 15-20%. (This has never happened until yesterday)
-Nova Launcher crashes maybe 4 times a day on average (This has never happened until yesterday)

By "Yesterday" I mean.. probably yesterday, but possibly just the last several days in general. I literally didn't do anything to my phone that would've caused this, other than simply rooting it. I just rooted it, no custom ROM or custom anything else..

Anyone know why this may be happening, or any fixes? Thanks!