As I posted a few weeks back, I encountered my first flat, and first crash. Since then, last Saturday, I experienced another flat, but was able to re-inflate the tube with a CO2 cartridge (enough to get me home), then again, today, another flat, same scenario. After my crash, I took the wheel into the shop and the mechanic (after checking the tube for leaks) said it was a bad tube (wear near the stem) so replaced the tube at no cost. Saturday I returned with the same wheel, and again, same scenario, bad batch of tubes from Bontrager. Tube was replaced at no cost. Between Saturday and today, I put a total of 13 miles on the bike. I ride, what I consider a "clean" road, and after inspecting the tire today, there's no evidence of puncture, it's the tube. On my way home today, I prayed I would make it, but was nervous the entire ride. Each time I mount the bike, I'm now frightened that I'll have another flat, and I'm unable to concentrate on riding and become obsessed with flatting. Is this the norm for riding a road bike and getting flats (this often, I mean). Mind you, I've had my Trek 2100 for approximately 5 weeks - three flats in 5 weeks seems like a lot.

Any advice would be appreciated.

Kathryn