Last night I did a factory restore on my iPhone and Apple Watch. Today I'm noticing my Apple Watch has experienced a sudden drop in battery life. I took the watch off the charger at 7am. I've only used the watch moderately and the battery is down to 4%. Any ideas what could be causing this drop? I'm stumped as I no longer have any third party apps on my phone. I did start using the modular watch face for the first time today. Could that be the problem?