When is EcO supposed to "beep"?
Once connected to your pool for the first time, it will always remain activated and will no longer beep. When you turn the EcO upside down, it doesn't "beep"? This is because it is already connected to your pool. The EcO only "beeps" when it is in standby mode.
Are you not receiving a new analysis from your EcO?
Check your connection parameters as explained in this article.