GLM model has a limit?

I’ve noticed on the characters, after about 18 or 20 responses, it just quits.  You type something in, it processes for 2 or 3 seconds, and then nothing.  I’m a pro user using the web interface, and it seems to only be the GLM model.  I can change to another model and it keeps going.  Then I go back to GLM and it’s as if it’s reached a limit and I can’t use it any more.

I’ve tried troubleshooting in a regular chat, but I can’t get it to do the same thing there.