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iPhones stored for forensic analysis unexpectedly reboot, causing problems for officials
(appleinsider.com)
This is a most excellent place for technology news and articles.
Because they have no actual proof of it, and direct evidence against it. They talk about phones communicating with each other to restart... yet a phone inside a faraday box restarted.
It's almost certainly just a software bug in iOS which is why it's inconsistent.
A remote command from some random phone to reboot does sound like the a wonderful vector for malware, though