Different clock timing with ST-LINK debugger in ST Eclipse between first execution after load code and after reset

[NVERZ]

I wrote my program and I try to debug it. In first execution I had a specific timing but if I stop code, I reset it from Debug tag all timing are double fast... so any comunication became impossible.

If i didn't use debugger without ST LINK connected timing is still fast.

Any idea? Thanks nino