iTunes will not sync selected music to iPhone 5
I'm running Windows 7 with iTunes 12.1 and an iPhone 5 on iOS 8. Typically, iTunes will just run through 6 steps to go through a complete sync, most of which is transferring songs and updated apps. However, after uninstalling my music library today from my iPhone 5 and then re-installing it, I noticed many of the songs I used to have on my phone were not transferred. Besides that, the songs remained grayed out on the "On My Device" tab in iTunes. They are available to play in iTunes, so I know the files are not lost. They synced up before I installed the 12.1 iTunes update, but now when I try to sync it only runs through steps 1 or 4 or 1 of 6 in less than 5 seconds. It's always inconsistent as to how many steps it actually tries. I've tried logging in and out of iTunes on both my windows PC and iPhone then logging back in, syncing over WiFi and restarting both devices including iTunes, nothing appears to be helping to restore the songs to my iPhone. Some of the songs are purchased songs from iTunes, which makes me wonder what else could be causing this. Any help would be greatly appreciated.