Taskbar Notification Background Apps, keep disappearing ?!?

[AWS]

Hello,
I have noticed that most of my background running apps, the ones with icons in the taskbar notification are (bottom right) keep closing/disappearing.
Things like my Asus Audio App, My Logitech G software, My AV etc.
Does anyone have any ideas as to why this is happening?
OS: Windows 8 Pro x64.
i5 2500k, 16gb RAM, 256gb SSD, 3tb HDD.
Thanks.

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