The seller is very disconnected, and the realtor is unresponsive at best.  

I've read too many posts about unresponsive listing agents and I didn't want to deal with them.

The tenant stopped paying rent and become unresponsive to emails, calls and texts.

I have one but I'm very unhappy with them (unresponsive, don't seem to have my best interests in mind, don't try very hard to to get property rented, don't try to shop for best contractors, just overall lazy).

Often I attempt to contact the owner but they are unresponsive (won't answer the door, phone, etc.).  

The CPA we're using now has been unresponsive and we have some questions we need answered.  

Finding an unconscious and unresponsive tenant that had overdosed. 

Neighbor is a tenant, landlord is unresponsive.  

Two other GC's that came to the property are completely unresponsive to my inquiries for getting their bids.

@David Lichtenstadter All the parties on the seller's side have been very unresponsive and unhelpful.