I'm sorry to hear about your experience. I would if it was the unit or a general problem in that model.
I will to be getting a tablet in the near future and will post my experience here when I do. I am really looking at the Asus tf300 right now. Transformer prime performance with better WiFi and the only draw back is the slightly lower res screen for a hundred dollars cheaper
Sent from my ADR6425LVW
That TF300 was second on my list for the replacement.
As for being either the model or particular unit, I am not sure, but a reviewer on Amazon had nothing but freeze problems with the Acer. He returned his and bought a prime.