Hello. Could you post some network details please.
Your upload speed and download speed. And if you can your ping rating. Try a speed test app or website close to one of your cameras.
How far away are your cameras to your router. How many walls / floors do they go through and what are they made of (brick? Wood? Plaster board? Etc).
Also could you perform a network test on one of your cameras via the app and report back your scores?
Do you have any bandwidth hungry activities going on when you encounter this issue? Are you using any heavy streaming services? Do you have any issues with any other devices ? Do you have say any other IoT devices? If so how are these working?
You mention that you have increased the speed so did the cameras you install ever work without the issue you are experiencing? If so what’s changed? Did you change your ISP? Router?
What phone are you using? The error you see is a connection to the Yi backbone system. Sometimes checking your location settings (on iPhones) is to move your location setting to never.
It could also be a temporary issue. How long have you had this issue?
Do you get the same issue if you are using mobile data or the same network or say another wifi network?
Here are a few things you can try:
Restart your phone
Power cycle your router (I accept you have done this multiple times)
Check that you have the most up to date iOS version
Check that you have the most up to date YI Home app version
Let’s try and get this easily sorted for you