Ok, so I did not give any follow up to this problem on my side but I made some advances.
To be clear: THIS IS NOT A SOLVED PROBLEM !
Here is how the problem was tested and bypassed on my side.
I have numerous types of Ring devices : Ring bells (both working perfectly), wired POE Ring camera (working perfectly), Ring stick cam x 3, battery powered, solar powered and plugged, none were working properly.
The diagnostics i was able to make is that this is deffintly a connexion issue.
The disconnection problem only happen when using my wifi mesh system (TP LINK DECO) on both houses were it is set up.
When I switch to an old router 2.4ghz only wifi, the issue is not happening.
When i connect to a Ring wifi extender, the issue is not happening.
Please Ring it is time to give this issue a real concern and try to debbug it. There is deffintly a patern here.
Is it a problem with 5ghz networks ?
Is it a problem with fast roaming on mesh systems ?
Common this cannot be rocket science !