I've had 2 go on new tubes!!
Sat watching the TV with a nearly built bike on a stand and whoooooosh.
Both tubes were bought at Hartlepool last year from a geezer selling stuff out the back of his van!!
Tubes were pumped to around 45-50psi
When I inspected them, one had an area of extremely thin tubing and it just gave out. Twas so thin it was nearly transparent. and the other the valve just gave out!!
Shite quality!!!