Possible, sure. You mean like the battery getting old? Capacitors getting arthritis? It's less than six months old. And it was a vaguely sudden change.
that would help a lot for sure.
Batteries would still lose roughly half of their maximum capacity over time though, afaik battery tech has not solved that yet.
Usually they arrive at the one year date though.
Otherwise, you should be able to track the culprit with the battery historian (unless it is hiding behind play services ..)