What firmware on the tablet are you running?
What OS is your PC running?
Set advanced power settings in USB disabled.
Try another USB connection.
Reinstall USB drivers.
Try another USB data cable.
GT-N5110 - Saferooted Stock 4.2.2
OTA - Kies Enabled
Download to SD Xposed
633x 64GB SD
Multi User @ 4 / WIFI JP 14 / DPI @ 213 in build.prop
Greenify & Experimental Features
Play Music frozen & Gallery thumbnail caching disabled
8+ hrs run time
12% per hr Netflix streaming with Miracast
3% drain on 12 hrs of standby WIFI on & Sync enabled
1080p 30fps MHL - Native
3D 1080p Miracast - Secondscreen app
500MB Standby / Wake