Bike making very loud rattling noise

Hello, so I sent my bike to an lbs for a full service, rim and cassette change. I haven't ridden any trails in the last two weeks due to the weather, just riding around for short bursts, sending down some stairs and small drops.

Today I decided to practice manualing and after awhile the bike started making a rattling sound, coming from the rear wheel and it got progressively louder, low and high gear. Can anybody help me identify the issue, should I send it back to the shop? Thank you