Hose- I had some problems a little while ago,and took 2 whole weeks off without lifting a ball. Sawbones yelled at me, and tried his best to get me to go see a Dr. Well, I got the name of a Dr., but haven't seen him yet... After my two weeks off, my knee is doing much better - although I do use a brace to lend a little extra stability. It felt so much better after that short break that I figure on laying off all summer and see how it does next fall. If it still bothers me then, I'll probably be forced to see the Dr.
Also, about your knee giving out, I had some back problems years ago, and every once in a while a nerve in the lower back would get pinched and cause my knee (leg basically) to give a little. Don't have any back problems do you? Got my back straightened out and haven't had this problem since. Good Luck!
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"Beer is proof that God loves us and wants us to be happy." - Benjamin Franklin