I really don't think that it's that big of a problem. The A70 is one of the hottest selling camera's right now. Which means that there are a lot of them out there and you are bound to hear some problems. I personally just replaced my A20 with an A70. I bought it off Ebay. I've had it for 3 weeks and have taken hundreds of pictures. I have had no problems with mine. I highly recomend the A70.
Good luck in making you choice.