I understand now and can’t give you a solution. Sorry.
I can tell you though that the most recent app update has some bug issues they are working on. Not sure if you updated recently. I also know they are actively working on the DBV1 issues as this has been a problem. Short of that, WiFi and carrier network issues could also cause load problems as well as an overloaded router. Other posts have described issues with accessing 2.4GHz WiFi cams from a 5GHz WiFi device on the same network.
There are a TON of things to rule out in order to troubleshoot the problem and I do not have the technical expertise to help you with that. Search the forums and you should be able to find a member who has dealt with this.