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

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

We have a lease clause that plumbing issues caused by the tenant that are not the result of a mechanical or material defect in the plumbing material are billed to the tenant.

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

Obviously holidays can cause a delay.  

We just discovered a crack in the concrete slab foundation that is a borderline major problem:- It is a vertical crack about 1/8 inch wide that is at least 9ft long, which is causing a 3/4 inch drop in the flooring and some evidence of old (luckily) limited moisture and termite intrusion. - BUT, it also appears old and probably a symptom of the original house settling.

A contract developed 10 years ago might be outdated in ways that will cause you an issue.

However, these activities should not cause concern for them.

For me personally, I would not take on a mortgage if it was going to cause the property to be cash flow negative.

It’s considered an act of god if a strong wind blows down a healthy tree that nobody expected to fall, but if a dead tree has been looking like it’s about to fall for awhile and the owner has been notified of the hazard it causes, then their inaction can cause them to be negligent in addressing the hazard, and they may be found to be liable.