Sorry to hear you feel you're being missed out in this, @Maclac. If you're still experiencing the issue, you can also reach out to our Technical support team to discuss this. They can be contacted on the phone number I sent to @4my earlier. We apologise for the delay, and not getting to you sooner.
Same problem Huawei Nova 3i, opening camera app dissconnects S3. Does NOT reconnect by itself. Most frustrating. Think I'll get rid of the watch. Obviously a very narrow support angle from Samsung. Very dissapointing.