ive never had a tube pop unless its way over. found out the hard way my mini electric pumps guage was off (80psi on guage was around 130psi in the tire) but a lot of people run 5-10psi over all the time. id say ensure your guage is accurate and if so probably a faulty tube.

aside from my inflation pop one time every tube pop ive had has been a slime filled tube and i cant fugure that out but i dont use slime anymore even if someone ask to have it put in... i say how about these tire liners instead.

i wouldnt worry just ride and have spare tube on you.