Fire shrimp cause of death unknown...

[craftytony]

So I found one of my fire shrimp upside down and dead this morning. Didn't look like anything had killed it as it was still in one piece. Anyone know what could have caused this?
I know my phosphates are high right now but everything else is pretty good.....

 

[dc]

I'd it look like it was starting to molt or anything? A lot of shrimp seem to die in molts, it's a hard process for them.

 

[craftytony]

didn't look like it....just very odd...laying upside down...