Why is my iMac dropping off as shared volume- Back-to-My-Mac

I have a 21.5" iMac 2.5GHz mid 2011, 12GB ram running Lion 10.7.4.
It is connected via ethernet to a gen 5 Airport Extreme, so Airport on the iMac is off. I am also running a MBP .
Both are on iCloud Back-to-My-Mac. When the iMac is awake, it shows up on the MBP as a shared volume. After it goes to sleep, it disappears as a shared volume. Wake for network activity is checked on the iMac. Sometimes it takes a little bit of time, but it always drops off after it goes to sleep.
I don't remember having this problem before. The only thing I have changed is that I had been using a 1st gen Airport Extreme and upgraded to this 5th gen.
I've checked everything I can think of but the problem persists.
Anyone have any thoughts as to why the iMac keeps disappearing?

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Why is iMac being dropped as a shared volume?

I have a 21.5" iMac 2.5GHz mid 2011, 12GB ram running Lion 10.7.4.
It is connected via ethernet to a gen 5 Airport Extreme, so Airport on the iMac is off. I am also running a MBP .
Both are on iCloud Back-to-My-Mac. When the iMac is awake, it shows up on the MBP as a shared volume. After it goes to sleep, it disappears as a shared volume. Wake for network activity is checked on the iMac.
I don't remember having this problem before. The only thing I have changed is that I had been using a 1st gen Airport Extreme and upgraded to this 5th gen.
I've checked everything I can think of but the problem persists.
Anyone have any thoughts as to why the iMac keeps disappearing?

I figured it out- it must be the printer.
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I'm trying to use screen sharing for the first time between my 27" mid 2010 iMac and 15" MacBook Pro Retina late 2013 using both OSX 10.9.4 on a local network using Back to my Mac feature. I enabled screen sharing and made sure Remote Management is disabled and also on firewall the screen sharing has allow incoming connections enabled. I also have my Back to my Mac checked on my iCloud settings.
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I'm away from home for work.
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Editing original post:
I'm trying to access my home Mac Mini from outside the home using a Macbook. I'm trying to use Leopard's screen sharing using .Mac and no luck, I can't see my Mac Mini outside my network.
At home, I've got the Mac Mini:
(1) running the latest Leopard
(2) connected to .Mac with Back to My Mac running
(3) File Sharing, Web Sharing, Remote Login, and Remote Management all on
(4) Time Capsule with the latest f/w updates running PPPoE to a DSL modem
At work, I've got the Macbook running:
(1) running the latest Leopard
(2) connected to .Mac with Back to My Mac running
(3) File Sharing, Web Sharing, Remote Login, and Remote Management all on
When I'm at home, I can screen share between Macs no problem. However, at work, I can't see my home Mac Mini. I know that it is possible to get through my company firewall because I can get my Slingbox to work at the office.
Suggestions where to start? I'm kinda stuck.

Why is my iMac dropping off as shared volume- Back-to-My-Mac

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