Problem with block toWorkspace

Hello everyone,

Forgive the disturbance but I have encountered this problem using arduino with matlab.

I'm using an arduino 1 board.

My goal is to acquire signals, using the toWorkspace block of Simulink, and then do some processing. The problem is that as long as I take 6 signals everything works perfectly, from the moment I use a seventh block toWorkspace all signals are empty, not being saved not even one data.

I specify that I have used as save formats: Structure with Time, I put the check mark to Log fixed-point data as a fi object and as sample time I have used the default one.

How can I solve this problem?

I have really tried everything.

Thanks to whoever will help me.