Today morning, my guitar was kept on bed and I plucked the 2nd string and the sound felt as if the string had touched the neck. Well, that was just once and it sounded fine once I started practicing but I was wondering whether it's a sign that the neck is starting to bend . It's a yamaha f310 and its been less that 2 months since I bought it. I had a cheap guitar before this and its neck got bent so I am concerned. Is that something to worry about or is it normal for guitars to sometimes sound like that ? And what precaution should be taken to prevent the neck from bending?