when system shutting down vs while system shutting down

Some examples from the web:

• A lot of people don't have three organ systems shutting down.
• No, you won't be able to give us enough, not without risking your system shutting down.
• Door security systems are shutting down.
• Ketamine induces coma and prevents the entire system from shutting down.
• Doctor says his systems are shutting down, that he won't regain consciousness.
• I'm afraid your entire system is shutting down.
• Systems are shutting down all over.
• All the ship's systems are shutting down, Captain.
• I gave him beta-blockers to slow the poison, but his systems are shutting down.
• Derek's system is shutting down... I'm losing him.
• Derek's system is shutting down,
• Systems are shutting down all over. I just lost power in the infirmary.
• October 10th, Genus Corporation was hacked by a cyberworm that tore through their system, shutting down their servers.
• Which gives off an even bigger gamma ray burst On top of what we're already getting hit with, And that's why our systems are shutting down.
• Which gives off an even bigger gamma ray burst on top of what we're already getting hit with, and that's why our systems are shutting down.
• Now, Pyrethrin, enters the cockroach's body through the cuticle, it's like your skin, and it immediately disables the cockroach's nervous system, shutting down its bodily functions... killing it entirely.
• We're trying, but the power-distribution system keeps shutting them down.
• There's no death rattle, her feet haven't turned blue, so her system isn't shutting down. ()
• It's shutting down her bodily systems.
• Okay, shutting down the old systems now.

Some examples from the web:

• A lot of people don't have three organ systems shutting down.
• No, you won't be able to give us enough, not without risking your system shutting down.
• Door security systems are shutting down.
• Ketamine induces coma and prevents the entire system from shutting down.
• Doctor says his systems are shutting down, that he won't regain consciousness.
• I'm afraid your entire system is shutting down.
• Systems are shutting down all over.
• All the ship's systems are shutting down, Captain.
• I gave him beta-blockers to slow the poison, but his systems are shutting down.
• Derek's system is shutting down... I'm losing him.
• Derek's system is shutting down,
• Systems are shutting down all over. I just lost power in the infirmary.
• October 10th, Genus Corporation was hacked by a cyberworm that tore through their system, shutting down their servers.
• Which gives off an even bigger gamma ray burst On top of what we're already getting hit with, And that's why our systems are shutting down.
• Which gives off an even bigger gamma ray burst on top of what we're already getting hit with, and that's why our systems are shutting down.
• Now, Pyrethrin, enters the cockroach's body through the cuticle, it's like your skin, and it immediately disables the cockroach's nervous system, shutting down its bodily functions... killing it entirely.
• We're trying, but the power-distribution system keeps shutting them down.
• There's no death rattle, her feet haven't turned blue, so her system isn't shutting down. ()
• It's shutting down her bodily systems.
• Okay, shutting down the old systems now.