I am not a doctor however was wondering if there have been any recent changes? Sine you mention it started in the last year. Has there been a new baby? New home? New daycare? My child had just turned 6 when he started wetting his bed again. Our doctor told us, we had a new child, moved away, got a new day care provider. He said it was a lot of stress for a child to deal with.
I hope you can find an answer.
You did not mention any medical workups. Have there been any? This invites evaluation.