Is anyone else experiencing arbitrary loss of communication with peripherals (like back-up disk)

Is anyone else experiencing arbitrary loss of communication with peripherals (like back-up disk)? The problem on my iMac also seems to involve my HP 2355 printer which ghost-enlivens periodically and resets itself like it has lost power or communication with the computer. I had the same problem on my MacBook Pro. I couldn't figure out why the printer screen was lit up when no one was using the computer. The loss of communication with the back-up disk also happened on the Pro. Two different Apple models; two different computers; two different back-up systems; two different printers. So, I am thinking it is not limited to one computer or computer type or printer.

None of the issues you describe occur on my iPad in iOS 5.
To begin with, reset your iPad: Press and hold the Sleep/Wake + Home buttons at the same time, until you see the Apple logo appear.

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