History: 3 month old series 4. The first couple of months ended the day with battery over 50%. Recently the battery dies before the end of the working day. No habits have changed as far as use. The background app update is turned off. Do one hour of exercise one day. On current watchOS 5.2.1. Just a sharp sudden decline in battery life.
Things I have tried: Soft reset Wipe and restore
Some thoughts? Known problem? Warranty Problem?