How long has it been? And the obvious: is it due to molt?
I like crickets as a feeder, but they have to be perfectly kept before feeding them to avoid viruses and infection. This means flushing their innards with fresh foods for several days. And, keep the crickets clean and dry. The dryer the better. Dont ever mist them, use water crystals.
How much misting of your mantis enclosures? After dry winter, we have to change our regime because it's just not as dry as it was. Mist less. I spray a very fine mist of distilled water to the inside lip of my cups for drinking once a day. Maybe a little in the fake foliage I provide. All the humidity comes from substrate alone, so a spray with with tap water once every two days, excluding humid species of course. They get it more often.
Excessive humidity is very bad for Hierodula.