Can't update iTune playlists on my iPhone 5

Question

I can't update the iTune playlists on my iPhone 5. When I check selected playlists on iTunes and connect the iPhone, it synchs but doesn't update the new playlists.

Answer 1

To fix this you should first quit all applications running in the background.
Instructions:
To shut down extra background apps, the first step is to access the multi-task bar on the phone. This is done by pressing the Home button two times quickly. A popup menu appears that shows all the background apps the iPhone has in memory. Items are displayed 4 at a time. If users scroll to the right, they will eventually see all apps that are currently open.
In order to manage background apps, users need to press down on one of the app icon in the Bottom until a red circle with a minus sign appears on each item.
Users should tap the minus sign next to each application they wish to close.
When users are done, they can simply press the Home button to return to the main screen.
After quitting ALL Application, power down the phone.
We will not do a normal shutdown, We are going to do a Hard Reset/Restart
Intructions:
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
Hope this helps!