Some areas are quite bad and cash flow can disappear in maint, vacancy, and delinquent rent.

Deferred problems don't just disappear, and someone will end up paying for it.  

We have several tenants that last for years, and we have tenants occasionally that disappear after a month or two.

Assuming you are talking about homebuyers, in many areas it has felt like all the buyers disappeared right after the Homebuyers Tax Credit expired.In many of these same markets there are signs of life.I would recommend that you contact a local RE agent and ask them what they are experiencing.If you are talking about investors not buying... unless an investor is using cash it is getting very hard to get any deals funded through more traditional means.

I had informed of them I only offer M2M as part of my screening test and they disappeared into the wind.    

I recently took over a triplex and was told by owner that the "tenant just left a note, her stuff and disappeared" So I figured it would be kinda like your place lots of random stuff/junk.

The important thing is that the REIA is used to tire kickers who show up and then disappear.

By 2022 and then disappear for a while on my boat.  8 down 12 to go.The first were easy to get i made some money on a modest lake I home I built and did a refi. 

The local papers reported a con women got her name added to a deed, then got a $200K mortgage via false identity, took the money, then disappeared.

You know what happens if they disappear?