Madagascar hissing roaches missing feet problems

[carpl]

Hi;

First hello to everybody. My name is Milan...

I raise Madagascar hissing roach for a one year and a half.

But now my roachs have a problem. They lose their legs last segment (foot) which is contains climbing pads. They looks like amputated. So they can't climb, they can't walk very well. They always spend time on the floor.

What is this? Is it disease? It is really interesting situation and i never see this problem before.

There is an some mites in bedding material. Can this mites eat foots?

Or it can be because older age of roaches?

How can i solve this problem? I don't want to lose my roachs.

Thanks