However, after two months, despite no closings, my success manager inexplicably stopped responding to my texts and emails, failing to schedule the promised biweekly meetings.

Sure, it will take a few days but worth its weight in gold. 

The judge granted the current second note holder a default judgment because the defendant failed to appear in court and respond to the summons. 

Most flippers fail miserably and never come on BiggerPockets.

Typically when I see failed Facebook ad accounts it’s due to improper implementation rather than the platform itself.

I'd then put in another offer-same as before  but for $4500 less explaining that the deposit the realtor has because they failed to present the amendment to the seller is the seller's money and therefore you are offering $4500 less (because they will get that money). 

There is always the risk that after you do the repair, the the system fails quickly after that. 

A tenant who fails to maintain a rental property could end up costing you more in property damage and court fees than the amount of rent they're paying you upfront. 

You don't want to bring over poor operations to STR because you will also fail there.

If you fail to follow the rules, you may open your personal assets to a lawsuit.