Check the Waterway jets. They will have a "R" number. The Waterway Powerstorm jets have undergone numerous revisions to the inserts and retainer rings in since their introduction in the early 2000's. The problem seems most common in the second largest size.
If your Waterway jets are R1, R2 or R3, demand new jets. If your retainer rings have no R# or say R1, demand new retainer rings.
Your retainer ring will be more difficult to see. Once you remove the jet insert, you can see it in the jet body. It may be white, black or grey. There are 2 screws holding it into the jet body.
Is it an Arctic? I would be surprised if they are still using old jets, they sell alot of spas and would not likely have old jets......
I know the tub is 7 months old to you, but what is the manufacturing date? Is it a 2004 or 2003. This was a big problem in 2002 and 2003 with many manufacturers.