Lacie Thunderbolt disconnecting and reconnecting spontaneously

My Lacie Thunderbolt drive is spontaneously disconnnecting (unmounting) and remounting about once a minute. I have tried shielding the cable ends with aluminum foil (found in another thread) but this doesn't help. Proximity to my iPhone 4S doesn't seem to make a difference. Switching to another firewire 800 cable next to the Thunderbolt cable doesn't make a difference.
(late 2011 MacBook Pro 15)
Any ideas?

Try restarting your phone and computer. Make sure itunes is up to date. Try different USB port.

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