It's not a glitch.
If you think about it, it doesn't make sense that you go into a game, intentionally die, don't get the supply crate then, but several games later. There is no reason a death in a game will impact future games, there is no logical reason to think that.
I get a supply drop every 45 minutes to an hour, they are more likely timed. I don't usually die right off the bat in games and get them pretty much around the same time like clockwork. I've never timed them but I can.
The only time I notice me getting them a little sooner is after I level.
But to think that a death in an earlier game, affects your game 6 games in the future is stupid and unfounded.
Besides, depending on most game modes aside from infected, are about 10 minutes a game. So you playing for an hour and getting a supply drop isn't because you died an hour earlier. It just so happens that you are awarded with them when you die, or get a kill, or plant a bomb, or defuse a bomb, or capture a flag.
I've gotten supply drops from all those things. Not just dying.
I'm 8th prestige by the way. I've got my hours in.