Sounds like a few problems; Forum search will help with the "no memory" problem ... ie nothing left on the root. Which in turn helps with installing apps, updating etc. Unstable may be due to limit file space on the root for various temporary settings to be stored. In sum ... forum search is your friend and patients can make a good product great. Btw its not a phone, internet tablet that can make phone calls, treat it more like a computer and it will seem more usable.