I also bought a Pluggable 7-port 60W USB HUB on Amazon for $30 USD. I don't have three GekkoScience 2Pac yet, but that's the intent soon.

Lately, I'm running two on the USB HUB and I keep getting ZOMBIE on one of the sticks. It is not a specific stick, but one will usually ZOMBIE out while the other is working okay.

I currently have it running at 200 Mhz at 9.11 watts. It chugs along at 22 Gh/s and will just die. I tried giving more watts up to 10 W per stick, but that didn't help stability.

My next step is to try 150 Mhz and see if that is better. 150Mhz takes up about 8 watts per stick.

Any thoughts?

[2017-10-24 13:34:14.872] Pool 0 difficulty changed to 8192
[2017-10-24 13:34:45.011] Stratum from pool 0 requested work restart
[2017-10-24 13:36:20.286] Stratum from pool 0 detected new block at height 491540
[2017-10-24 13:37:12.733] Accepted 070945dd Diff 9.31K/8192 GSD 0
[2017-10-24 13:39:31.761] GSD 2: No valid hashes recently, attempting to reset
[2017-10-24 13:39:31.910] GSD 2 attempted reset got err:(0) LIBUSB_SUCCESS / LIBUSB_TRANSFER_COMPLETED
[2017-10-24 13:40:02.727] GSD 0: No valid hashes recently, attempting to reset
[2017-10-24 13:40:02.790] GSD 0 attempted reset got err:(0) LIBUSB_SUCCESS / LIBUSB_TRANSFER_COMPLETED
[2017-10-24 13:40:35.835] GSD 2: Device failed to respond to restart
[2017-10-24 13:40:35.880] GSD 2 failure, disabling!
[2017-10-24 13:41:06.575] GSD 0: Device failed to respond to restart
[2017-10-24 13:41:06.648] GSD 0 failure, disabling!
[2017-10-24 13:41:15.410] Stratum connection to pool 0 interrupted
[2017-10-24 13:41:15.687] Pool 0 successfully negotiated resume with the same session ID
[2017-10-24 13:41:15.688] Pool 0 difficulty changed to 8192
[2017-10-24 13:41:20.406] Stratum from pool 0 requested work restart
[2017-10-24 13:45:20.311] Stratum connection to pool 0 interrupted