I'm afraid that no-one here can tell you what Apple is or is not aware of. You are not talking to Apple here - this is a user-based technical support community.
1. Bluetooth and Wi-Fi
That is expected behaviour, not a bug. Turning off Bluetooth and/or Wi-Fi via Control Centre on your iPhone does not fully turn off those features. Apple Watch remains connected via Bluetooth with your iPhone.
To fully disable Bluetooth and Wi-Fi, either turn off each of those features off via Settings (Settings > Bluetooth, Settings > Wi-Fi) or enable Airplane Mode on your iPhone.
How notifications behave depends on the status of your devices and your settings. With Wrist Detection enabled, in order to bring notifications to your attention as soon as possible:
- If your iPhone is unlocked, then you will receive notification alerts on your iPhone instead of on your Apple Watch.
- If your iPhone is locked or asleep and your Apple Watch is unlocked (regardless of whether the watch display is asleep or awake) and on your wrist, you will receive notification alerts on your watch.
- If your Apple Watch is locked or has Do Not Disturb enabled, then notifications will go to your iPhone.
- More information: Notifications on your Apple Watch - Apple Support
Whenever your Apple Watch cannot connect to the paired iPhone via Bluetooth, it will attempt, as a fallback, to connect to a compatible Wi-Fi network.
A compatible Wi-Fi network is an 802.11b/g/n 2.4GHz Wi-Fi network that your iPhone has connected to before whilst your Apple Watch was connected to the iPhone via Bluetooth. Apple Watch cannot connect to 5GHz Wi-Fi networks or to public networks that require logins, subscriptions or profiles.
To check whether your Apple Watch can connect to Wi-Fi:
If your Apple Watch does not connect to Wi-Fi as expected (after allowing a few moments), then follow these steps:
If you have not yet done so, update your iPhone and Apple Watch to the latest software, starting with your iPhone:
Firstly, ensure that your Apple Watch and iPhone are connected via Bluetooth and also that your iPhone is connected to your Wi-Fi network:
On your iPhone, go to: Settings > Wi-Fi:
- Tap on the "i" / info icon to the right of your Wi-Fi network name > tap on Forget This Network.
- With your Apple Watch still connected via Bluetooth, reconnect your iPhone to your Wi-Fi network, being sure to check that you are connecting to an 802.11b/g/n 2.4 GHz network.
- Pause for a few moments to allow the Wi-Fi information to be shared to your Apple Watch.
On your iPhone, enable Airplane Mode:
Check whether your Apple Watch has successfully connected to the Wi-Fi network by checking for the Wi-Fi icon at the upper-left of Control Centre (allow a short while for it to connect after losing the connection with your iPhone):
When finished, turn off Airplane Mode on your iPhone.
If you have not yet done so and if the feature is supported on your plan, you may also wish to enable Wi-Fi Calling on your devices:
If the issue persists, then I suggest that you contact Apple Support (remote diagnostics and/or mail-in service may be available, if required), make a Genius Bar reservation or visit an Apple Authorised Service Provider for assistance:
4, 5 & 6 Third-party apps
If you have not yet done so, it may help to update both your iPhone and Apple Watch to the latest software, starting with your iPhone:
And also to install any available updates for the apps (via the App Store > Updates) on your iPhone.
For assistance with any remaining issues concerning the use of third-party apps on Apple Watch, I suggest that you consult the respective developers' support resources and/or contact the developers.
3. Heart rate
Whilst I can't say why that has been happening, the following steps may help to stop if from happening again (check performance after each before moving on to the next):
If you have not yet done so, update both your iPhone and Apple Watch (see above for support links).
Close certain apps and restart both your iPhone and your Apple Watch:
If you have ever (not necessarily recently) previously used the Workout app and/or any third-party fitness, heart rate tracking or sleep tracking apps on your Apple Watch, then check on your watch to see whether there is an active or paused activity within any of them:
- If there is, then end that activity from within that app on your watch (not your iPhone).
- If in doubt, remove any such third-party apps from your Apple Watch.
Unpair and re-pair your watch:
If the issue then persists, I suggest that you contact Apple Support (remote diagnostics and/or mail-in service may be available, if required), make a Genius Bar reservation or visit an Apple Authorised Service Provider for assistance:
8. Unexpected locking
Check that you are wearing your Apple Watch sufficiently snugly on the top of your wrist (if it is worn too loosely, your watch may believe that it has been removed from your wrist).
Wearing your Apple Watch - Apple Support
Wrist Detection can be affected by temporary or permanent skin changes, such as by some wrist tattoos:
Get the most accurate measurements using your Apple Watch - Apple Support
If the issue persists, then I suggest that you contact Apple via the links above.