Red runners dying

Twilightroach

Second Instar
I have had a stable red runner (Turkistan roach) roach colony for a couple of years. Everything was fine. But randomly the other day the colony suddenly had massive deaths. I don't know why they are dying! There is no mold as far as I can tell. They were fine one day and then literally the next there were dozens of bodies all over.

It is like they are just dying for no reason all stages of the roaches. The only thing I can think of is maybe I put a bad apple in there, other then that nothing has changed or could possibly cause this that I can think of.

Has this happened to anyone ever? is it some kind of colony collapse?

 
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