Apple Watch screen not turning off anymore Usually my Apple Watch's screen turns on when I raise my arm, and then it turns off either when I put my arm down, or if I leave my arm in that position for 15 seconds. This has always been the case

For some reason this isn't happening anymore, since around yesterday. When I raise my arm, the screen remains on even when I put my arm down, and also doesn't seem to turn off even when I wait for it to.

What can I do in this circumstance?
I fixed this by restarting both my watch and my paired phone simultaneously (restarting only the watch potentially would have solved the problem). Right now it is turning off as expected.