I am having this same issue with my Eufy doorbell going offline frequently. I contacted Eufy support and after getting conflicting information this is their final response - due to regional reasons they are unable to even offer an apology???
Dear Customer,
Thank you for your patience.
We have released a new version to solve the doorbell offline problem some time ago. However, if your device is still not resolved after pushing the new version, we are very willing to provide you with a warranty. Unfortunately, we cannot deliver to Australia, so we are sorry that we cannot provide you with further assistance. We are happy to provide you with a discount. Unfortunately, we cannot provide discounts on the Australian official website. I am really sorry about this.
Unfortunately, due to regional reasons, although we would like to offer you a discount and express our apologies, we are unable to do so.
We once again deeply apologize for the inconvenience the product has caused you and have a nice day.
Reference TicketTNQ411835995 if contacting a CSR
Shane
Eufy Customer Support Manager