Ideas for consistently popping tubes I ride a cyclocross about 50 miles a week. About half of the mileage is spent on roads, the other half on single track trails. In the space of 3 weeks I have had the tubes pop 5 times. Once the back tube popped while riding on the road near my house. The other four occurred while the bike was hanging in my apartment. 

I have double checked the interior and exterior of the tires for debris or objects and found none. I ensured tires were inflated to proper pressure and that the rim guard strips were in the correct place. I purchased the bike about a month ago from the neighborhood bike shop. 

Is there anything I am missing? My current hypothesis is that the tubes degraded in the shop and spring leaks due to age. If that is the case, is it proper to ask the shop to replace the tubes with new ones?

Edit: August 2016 

Hundreds of miles later on the same tires, rims, rim tape I have not had a single flat. I replaced the problematic tubes and tried to hold all other variables consistent. I was not able to determine the cause of the problems but it does appear the tubes that came installed from the bike shop were more brittle than expected. This could have been due to shop storage. Extended exposure to heat or light can weaken butyl tubes despite being more resilient to weathering and attack than natural rubber.
I had tire busts when I used tubes that were pre-filled with Slime: they burst within an hour to a day of installing them. When I switched to standard tubes and then added Stans No Flats liquid they were fine. This happened twice to me: very strange.

I always use Stans in my wheels: either MTB tubeless or commuting/road bike tubed. Is a bit of a hassle with Schraeder tubes because the tubes with removable valve cores are not so common (altho Continental sells). But I use a syringe and a tube to "inject" 50ml of Stans into the tubes: helps a lot with flats (although won't solve this issue).

Are you using really light tubes? I've found them more likely to cause problems if your rim/tire combination isn't exactly right. Also check that your tubes really are the right size for your tires: not just the diameter but the width. It might be worth spending a bit more and getting better quality tubes next time: I've found Continental good, and they offer a big range of tubes. Maybe you're using big fat cyclocross tires and tubes mean't for a road tire. They all fit, but will be much more stretched, and more likely to fail, especially if the rubber is not good quality and tough.

When you install the tubes, are you maybe pinching them? I partially inflate them and try to install just using my thumbs. Then I go around the wheel and roll the tire back and forth with my fingers and make sure the tube is not trapped under the bead: check both sides. Then I pump it up to max and possibly deflate it a bit if I don't ride it at max pressure.

I doubt it's your tires, but try taking them off and running your fingers around the inside: you can feel problems better than see them.

I also doubt it's your rim tape, but I often add a layer or two of electrical tape over it: especially if I am using high pressures.

If nothing is wrong in particular, I bet you can solve it by using better quality tubes.