What causes the automatic unmount of mounted shares?

Hi all,
I was wondering what would cause a share to automatically unmount...
Let's say I mount 3 shared folders located in 3 different machines on my LAN (AFP shares).
"SharedFolder1" is on "Machine1"
"SharedFolder2" is on "Machine2"
"SharedFolder3" is on "Machine3"
From "Machine0" I can read and write the content of all the shared folders.
However, when I come back the next morning, only "SharedFolder2" is mounted (on "Machine0") and I get no error message (at least none that is still visible). I can remount "sharedFolder1" and "SharedFolder3", but I was wondering why these were unmounted on "Machine0"... All I know is that "Machine1" and "Machine3" didn't reboot nor shut down...
Maybe it is a setting on "Machine1" and "Machine3", respectively?
Maybe they went to sleep?
Maybe this is due to user switching on the remote machine?
Maybe there's a time limit where an idle mounted share would be automatically unmounted?
I don't know, there are so many settings... and I could run a lot of tests to figure it out...
Does anyone know what can cause a share to be unmounted?
Thank you very much in advance for your help.
Best,
-a-

"Since I recently bought a Time Capsule, I set up a sharing volume with my wife's computer. I set wake on demand and it works perfectly. Even putting her computer to sleep and mine gone to sleep, the volume stays mounted. When I wake mine up, the shared folder from her computer ejects momentairly on startup, but remounts imediately after fully waking. Her computer is still in sleep mode."
     Exactly the behavior I would be expecting...
     Although I would also expect a password prompt if it is not stored
     in the client...
"So, to answer you question, if wake on demand is set up correctly on the shared computer, the shared folder does not eject when putting shared computer in sleep mode.
But, if the sharing computer looses power or wake on demand is not set or working correctly, it will disconnect and eject the volume."
     This is what I get right now, but different shares
     (different remote machines)
     behave differently, some of them unmount, while other
     remain mounted...
     I can't find out what the difference is among their respective settings.
"Apple says it requires an Airport Airport Base Station or Time Capsule with up to date firmware for wake on demand to work, so I don't know if any other router today will support that feautre for Apple. I know for sure my older router did not have the capability and I could never find a work around."
     Why the heck to they ALWAYS do that?!?
     Whatever... Thank you very much for your answer anyway.
     Happy Holiday
     -a-

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