One 3750X stop in a stack

Hi,
In a wiring closet this morning one 3750X switch in a stack of three switch was not working. No led at all. I unplug the AC power and remove the stack-power cable. Meanwhile the 2 others switch continue to operate without problem since I have a fiber link on switch 3. Plug back the AC power into the switch 1 and it join the stack and work as usual. Plug back the stack-power after.
What can cause a switch to stop operate suddenly ? It's the second time this problem happen. No message in the log.
If you have a hint where to search, I will be very happy.
IOS : 15.0(2)SE
Thanks.

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You might consider upgrading your IOS.  Leo, I believe, would recommend 15.0(2)SE4.

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