First, an echo is different than a garbled sound. An echo normally happens when you try to talk to your phone at a place close to your iseeBell device. Here's an article talking about The Echo.
Simply put, the reason causing the garbled sound is your internet.
You may say, hey, I have the best plan from my ISP (Internet Service Provider), why should I still experience any garbled sound or glitched video streaming? Our official requirement on the Internet is at least 2Mbps (two Megabits per seconds). Most of the U.S family have a number greater than that. As a matter of fact, the average internet speed of the U.S is 10.7 Mbps. However, the part you don't know is that you may be sharing your internet bandwidth with your neighbor or your community who use the same ISP. The internet speed is truly fluctuating. Do you often feel the internet is slow around 7 or 8pm when everyone is at home and using the internet? Do you always see the same or different number when you test your internet speed using speedtest.net? And also be aware that watching a YouTube Video is different than watching a live streaming from your iseeBell, as when you watch YouTube videos, those videos were already stored on the server while watching iseeBell live streaming is nearly an instant process. So when you experience a garbled sound or glitched video, it is most likely your internet speed is at a valley point on a curve of the internet speed.
Be a little bit more patience and higher tolerance to Wi-Fi product. Go back to the app home screen. Wait for a couple minutes and try again. I'm sure it will get better.