A bad tenant can cause way more in headache and costs. 

Refinancing  immediately prior to a sale - yes that is a cause for some seasoning. 

And this caused some deals to experience major distress and/or implode. while others continue to hum along as planned.

The other option is a water supply line, but that would typically resulting a steady leak and the damage would occur faster.Really think about what is above that space that could cause the issue.

  " Inventory should increase and prices should dip" Ray,you were so wrong in that prediction because as everyone knows, the  interest rate dropping and many people's rush to buy housing so they could work remotely actually caused price increases in so many places.  

Even the threat of court has caused some guests to pay up.

This is causing a huge influx of people moving here for jobs.

Very satisfied with the results, operations and and the ability for both manual and automatic shut off before a leak can cause damage.. 

I would recommend getting the tenant to admit that they had done something to cause the problem.

Do you understand what conditions caused the issue?