Some times in between there in rougher economic conditions it was getting unexpected vacancies. 

This can cover unexpected vacancies or repairs.

You also may need to start with more capital so you are prepared for unexpected situations.

So even if you pick a state with stronger protections like WY or NV, the cause of action arose in the state where the tenant fell, so likely that the court where the accident happened would have jurisdiction.

When that same accident happens 6 times in a year it would start to look a little less "accidental".

Screen tenants thoroughly, have a solid lease, and maintain an emergency fund for unexpected expenses.

Expect delays and unexpected expenses: No matter how straightforward the project seems, having a contingency fund for emergencies is essential.Your Team matters.

Be prepared to face fluctuations in the market, unexpected repairs, and tenant issues.

You can't even get an officer to a traffic accident anymore and how many domestic violence situations happen with little to no attention.  

You’ve developed a moderately fast wealth accumulation strategy that’s relatively low risk, enabling you to ride out down cycles, negative cash flows, unexpected necessary expenditures, etc.