Steel HR does not reconnect

I have the same issue, I am using a Sony Xperia 5 ii and every time i walk away from the phone and come back the watch will not reconnect to the phone.

I also have to go back into the healthmate app and waiting for the device to reconnect.

The same here, iPhone XR. It kind of loses its purpose if you need to check if your watch is connected (while your phone sits on your desk next to you) to make sure you get the notification :( I never "kill" the app, it should be running in the background, but as others say I need to manually open it and wait for syncing. Please let us know how to solve this. (I have ScanWatch 42mm)

I have the same problem, the watch is not reconnecting without opening the app.

The extra info I can give is that blueetooth connection with the cell (iPhone SE 2020) is working well. I mean, if I open the bluetooth menu (in Cellphone Configuration) the "Steel HR 9B" is connected but when I check inside the Health Mate app, the watch is not connected inside "Devices". It's clear that there is an internal problem between app and cellphone as the watch-cellphone reconnection is working properly well.

Same problem here with Scanwatch 42 and iPhone 12 Pro Max. Same health app version on my old iphone x works flawless. 

Is there an answer to reconnecting issue , wanted to update my steel to scan but worry similar problem may occurs.