I've had this problem with MEC tubes, so much in fact that I have stopped using MEC tubes (a number of years ago now) and use, almost exclusively, Continential.

Now, it CAN happen with the Continentials, but it is infrequent and if it does happen the tube is getting long in the tooth anyway or was caused by a poor pumping method.

With the MEC tubes, it happened almost immediately, or very soon after installing.

As a side note, do not buy the MEC patch kits either. The patches don't stick, or perhaps its the glue.