I purchased a "Samsung Refurbished" Tab Pro form an authorized reseller, the device was very glitchy. It would randomly crash and screen would blink when doing difficult tasks. Called Samsung customer support and was told most likely a memory issue and to return item for repair. Several message boards discuss the problem and the need to download a 150 Mb software update to correct the problem. I did that and still had the problem. I ended up returning the tablet and went to Best Buy (Black Friday Sale) to purchase a new one.
If you want to recreate my issue to see if your refurbished unit has the same problem, download google earth and zoom in on your location. It always made my screen blink then would shut down the unit and do a reboot.
Normally I like a refurbished item, but in this case, I decided to go with a new unit which comes with a one year warranty.