My apple watch says it's connected but It's not really connected

Hi guys,

This issue is super weird.

My apple watch is connected to the iPhone (according to the bluetooth screen on my iPhone, and as well to the first screen of the setting [drag up] on my watch).

BUT:

1. I Don't recieve notifications on my watch.

2. iMessages not updated since last night on my watch.

3. I can't connect to the music library. Message is -

"Can't Connect. Apple watch can't connect to your iPhone Music Library. Press firmly on the display to choose another music source."

4. Don't recieve Phone Calls.

5. Can't make calls. (Although I can reach my contacts).

As long as I know, I didn't change anything on my watch or on my iPhone since this thing happened.

I tried turn the watch and the iPhone off and on. Tried to turn off bluetooth on iPhone.

Tried to set the Wrist Detection off (read it somewhere). Nothing helps.

Obviously - no silent, Do not disturb, airplane mode or something is turned on. although it has nothing to do with this type of weird behaviour.

(Just trying to prevent some obvious comments here).

This is very annoying,

I read that unpairing causes some problems, so I haven't tried it yet.

Suggestions ?

Thanks !!!