Dubia roaches go paralyzed?

Hello friends, I have a dubia roach colony and I’ve had it for about 7 month. They have been thriving well. They eat, they are energetic, not weak, they are reproducing, but a few seem to go paralyzed and can’t move... they will inch to try to move but they can’t. I’ve been making there food, I pure apple, carrot, collared greens, sweet potato, oat bran, wheat bran, and orange. I don’t know what is happening.
 
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