The WH-1000XM4 headphones won't pause or the Wearing Detection function doesn't work
This may occur after moving from a cold to a warm place or after wearing the headphones under sweaty conditions.
If the proximity sensor part inside the left unit housing gets fogged up, or if there are water droplets on it due to condensation or humidity (from changing temperatures or sweat, for example), the Wearing Detection function may not work properly. If this happens, leave the proximity sensor part facing up until the moisture disappears.
IMPORTANT: In order to prevent it from being scratched, do not touch or wipe the proximity sensor part.