I bought a new bicycle earlier this month. My problem is that the bicycle chain keeps falling off. I thought that this occurred because I switched gears too quickly or something so now I keep it in 6th gear (7 total gears). Unfortunately, the chain still falls off sometimes, usually when I am coasting and not moving the pedals or if the chain is moving faster than I am peddling. Please give me advice on how I can fix the bike once and for all. I have no problem putting the chain back on, but I don't want it to keep falling off. Thank you.