I recently purchased a 7.4 FX - Trek Bicycle

I put over 100 miles on it within the first week and I'm already noticing a few things. I ride everywhere from paved roads to seldom off road. I weigh 170LB

- When I ride against strong winds, my bike makes squeaky noises like the sound of nudging an unsteady chair. I often mistaken the sound for a squirrel or some small animal... but it's definitely the bike and I don't know what it may be? Makes no noise under moderate wind

- The chain 'derailed' twice within two days. First occurrence was at night when I accidentally collided with another cyclist at no more than 10MPH. The impact was so minor we both remained mounted on our bikes, but I was unable to pedal - how can a head on collision derail the chain so easily? Another occurred today while sketching out a field, I went off road and onto shallow sand - then hit some flat object that looked like the remains of a traffic cone. The object was completely plastic with no jagged metals sticking out or anything. Minus a little grime on the hands, it is a simple fix but it baffles me how easily the chain can derail. How bad is derailing for the bike? Is it possible to keep a tenacious chain?

- I notice the spokes on the front wheel bending as I drop from high sidewalks or hit wicked potholes... I know they are absorbing the impact but is there a threshold? Will the spokes/wheel/fork give easily? In NYC running through these are inevitable and I am concerned with the longevity of this bike. This bike seems a little fragile...