Originally Posted by Kai Winters

It is possible you got a bad tube.
Our shop recently, past spring, had a batch of faulty tubes. We bought perhaps 50 tubes and while repairing flats they would burst at the valve. We thought it was us but after it repeated for 10 or so tubes in the same place it was clear it was the tubes. Likely just a problem at the factory. We received credit and that was that. We checked the other tubes and some were faulty the rest were fine. These were 700c tubes with a presta valve.
It can happen.
Make sure when changing a tube to check the rim strip to assure it is still doing its job. Check the tire carefully for the possibility of a sharp shard embedded that will cause a puncture somewhere down the road. Check the tire condition for wear, cuts, etc. Make sure the tube is not pinched under the bead when installing the tire.