Since buying Vivoactive 5 Music a month ago, the app disconnected my device 4 times already. Is it software issue?

Since buying my Vivoactive 5 Music 4 weeks ago, the Garmin Connect App disconnected my watch already 4 times (meaning, I had to "register" it again and go through the whole set-up). 

Additionally, I have connectivity issues with my phone. Despite my phone being with me in the house, if I am not in the same room, it will disconnect from bluetooth and I get consecutive alerts every few seconds ("phone disconnected" > "phone connected" > "phone disconnected" > "phone connected").

To solve both issues I tried:

- Software updates on phone and on watch to have the latest versions

- Turned off and on my phone and my watch

- Removed device from Bluetooth and add it again

Is this a software issue that can be solved, or is it a problem with the watch itself?