All four of my 2Pac's won't stay mining suddenly. Earlier this afternoon they were working fine. Left for some dinner and came home and now they aren't detected by cgminer.
I can connect to the Pi and have tried turning everything off, disconnecting them from each other, and turning them back on. I turned off the cooling fan and I can feel heat on the heat sinks building. It has been my experience that if cgminer isn't running there shouldn't be any heat coming in heat sinks. I have green lights on everything but no blue flashes.
I did get the boards to start churning numbers once after rebooting everything. They hashed for about a minute, maybe two, then shut down again. This appears to be a fluke as I have tried again a couple without being able to replicate.
Any idea of where start looking?
Here is what I see if I start cgminer by hand (I usually start it from /etc/rc.local).
cgminer version 4.10.0 - Started: [2017-04-02 21:51:17.058]
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(5s):0.000 (1m):0.000 (5m):0.000 (15m):0.000 (avg):0.000h/s
A:0 R:2048 HW:0 WU:0.0/m
Connected to us-east.stratum.slushpool.com diff 2.05K with stratum as user lanegg.worker1
Block: 106a502d... Diff:500G Started: [21:51:17.060] Best share: 0
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[U]SB management [P]ool management [S]ettings [D]isplay options [Q]uit
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[2017-04-02 21:51:15.887] Started cgminer 4.10.0
[2017-04-02 21:51:16.055] No devices detected!
[2017-04-02 21:51:16.056] Waiting for USB hotplug devices or press q to quit
[2017-04-02 21:51:16.058] Probing for an alive pool
[2017-04-02 21:51:16.624] Pool 0 difficulty changed to 2048
[2017-04-02 21:51:16.704] Rejected untracked stratum share from pool 0
[2017-04-02 21:51:17.060] Network diff set to 500G