The 3 out of 5 (different for horses) is a safe harbor. Within that, the IRS would have to prove you're not a biz. Outside the safe harbor, the biz has to prove they're a biz using the IRS factors and other reasonable issues. It's possible a biz is changing to get out of losses or that the losses were due to natural disasters and take time to rebuild or...for more years.
We usually can tell when our clients are just dabbling and it's a hobby.
I had an artist who worked hard on her art and on her biz, memberships, shows, sales. But over the years, she got busier with her kids and seemed to be treating her art less businesslike. We had a chat about 3 out of 5 and IRS scrutiny, and changed her treatment to a hobby.