Received mine a few weeks ago. Both have been running fine connected to a powered USB hub, humming along at 200 MHz with a fan. Yesterday I rebooted my raspberry pi, and now one of them won't seem to start hashing, no matter the frequency I specify. It just keeps cycling into failure. The other one is fine, and works with no issues.
cgminer version 4.9.2 - Started: [2016-04-30 19:09:20.472]
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(5s):0.000 (1m):0.000 (5m):0.000 (15m):0.000 (avg):0.000h/s
A:0 R:0 HW:0 WU:0.0/m
Connected to stratum.XXXXXX.XXX diff 1.02K with stratum as user XXXXXX
Block: 293f16aa... Diff:179G Started: [19:09:20.473] Best share: 0
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[U]SB management [P]ool management [S]ettings [D]isplay options [Q]uit
1: COMPAC 10002743: 150MHz | 0.000 / 0.000h/s WU:0.0/m
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[2016-04-30 19:09:17.980] Started cgminer 4.9.2
[2016-04-30 19:09:19.468] Probing for an alive pool
[2016-04-30 19:09:19.631] Pool 0 difficulty changed to 1024
[2016-04-30 19:09:20.473] Network diff set to 179G
[2016-04-30 19:09:31.166] COMPAC 0: No valid hashes for over 10 secs, attempting to reset
[2016-04-30 19:09:31.167] COMPAC 0 attempted reset got err:(0) LIBUSB_SUCCESS
[2016-04-30 19:10:31.154] COMPAC 0: Device failed to respond to restart
[2016-04-30 19:10:31.155] COMPAC 0 failure, disabling!
[2016-04-30 19:10:34.181] Hotplug: Gekko added COMPAC 1
[2016-04-30 19:10:45.116] COMPAC 1: No valid hashes for over 10 secs, attempting to reset
[2016-04-30 19:10:45.117] COMPAC 1 attempted reset got err:(0) LIBUSB_SUCCESS
I've tried changing the voltage, switching USB reports, and even plugging into a different device (OS X laptop), and this one just never gets going. The light is green, just not sure how to get it going again.
Any suggestions?