Recently purchased a 27.5 tube and put it in my rear tyre,pumped it up to 40 psi,seated properly with no abnormalities,left it at 40 psi and it blew up overnight,tyre is fine,tube is a right off,,tyre is rated to 50 psi,and rim rated to 3 bar,has anyone else had problems with giant tubes?

[Mod. moved to MTB gear]