Has anyone yet asked when it locks up can you access the diagnostic tool at all? What color is LED? etc... In fact there is an entire pinned post that asks a bunch of standard questions.
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Only two know possible issues other than hardware failure.
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If you are using Ethernet, I think the C8 is still susceptible to getting locked up from Jumbo Frames multicast packets that reach its ethernet port.
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If you have it on Wi-Fi, it is susceptible to get disconnected from the Wi-Fi and not reconnect if the router does automatic optimizations (often in the middle of the night) where it scans the Wifi bands and then adjusts it channels.
