I lose aperture wen I am zooming in and out. On the end I have just F-- and I can't change the f stop. Any Idea what to do?

What is the lens you have attached?

Canon 24-70mm f2.8 but Tokina 11-16mm f2.8 doesn't work properly too....

Is it the vibration of zooming causing the electronics to lose contact? I suggest emailing Metabones and ask for a replacement.

...do you know how long dose it take to have a new adapter back?

I have that lens. Canon 24-70mm 2.8 on a speedbooster and fs700. I can confirm it works fine, no issues.

The speedbooster is a much tighter fit than the first version (square interior). I have to hold the camera vertical if I want to take the lens off the speedbooster and its not on a tripod.

Also the default is now "green mode". You can hold the "wide open" button on the adapter as you turn the camera on (and two other variations of that on their site, camera on first then attach), which will put it in a different mode. Maybe its stuck in a mode. Bounces back once you turn camera off. Maybe give that a quick go. In that mode, I have to push the iris button in indoor light, else that lens bounces around iris constantly.

I have the tokina 11-16mm as well, but in a sony amount. So cannot stick it on the speedbooster presently.