Hi Aden Crater, Sorry to hear your having Trouble with your Note 3.
This is most likely just because theres a few applications running in the background then the phone can handle and your ram (random access memory ) might be a little backed up. first you'll need to clean up all the temporary files located on your phone, this can be done with a program called ccleaner (you can find it on the play store) just intall and run its cleaner to get your phone in order. Learn how by useing the following link:
Next, you'll want to limit the amount of applications running in the background. Check out this neat form below that will walk you through it
If you have anymore questions fill free to email me at firstname.lastname@example.org
Devin A. Stokes