In an incident less well-known than Speedbird 9's ash cloud confrontation, I seem to recall a BOAC/BA VC10 suffering a 4-engine flame-out while in the cruise somewhere in the region around Bangkok.
Early mid-'70s? The story that I heard was that it was the consequence of lack of communication between the 2 front seats and the F/E, but I'm sure that was just a calumny.
Recovered with a RAT-driven relight at 6000 ft? Something like that, perhaps.
Edit. Some research on my own posts reminds me it was 1974, and something to do with fuel starvation, as opposed to lack of fuel in the tanks, of which there was plenty.