Instruct: Classify Amazon reviews into positive or negative sentiment
Query: DON'T BUY! History of unfixable lockups!

I've had my Sansa c140 for just over a year. Several times it has locked up, and I've managed to get it working again. Now it won't connect to my computer, all text is missing from the menus, and tech support isn't responding. (Being out of warranty, they probably won't.)From what I've seen, this is a common problem, with no fix posted. Personally, I will avoid Sansa products in the future. I will certainly NOT buy another one of these!