Cant download music onto my s3-- HELP!

[glittersprinkler]

So for the past few days my phone has been stuffing up. With the battery draining so fast and the screen turning on and off whenever its nearly low batt. And tonight I was gonna download a song from the app that i use called simple downloader. However it wont let me download. It kept saying download unsuccessful or it would take forever(10-20 minutes) for 1 song when it usually takes 1 minute.

Im freaking out at the moment and i need help asap.

 

[VW Maverick]

Hello.
Could the phone be full up with other music, pics, etc?
Are you trying to download with data or Wi-Fi?

Mav.