Running into trouble w/ SRBminer version 1.6.8 on my mining rig with 12 rx580 gpus (driver 8.15.1 or 8.16.1).  Miner is now failing to start 1-3 gpus (gpus showing 0 hashes) after receiving jobs from pool.  This was not a problem with SRB 1.6.7 on driver 18.3.4.

Miner works fine if I split into two jobs of 6 gpus, each.  However, this messes with the algo switching.  Anyone seeing anything similar or have a fix?  Reducing intensity or reinstalling drivers doesn't work.  Perhaps there's a timeout issue when attaching a larger number of GPUs under the latest drivers?

Log trace

[2018-10-20 15:00:54] json_receive: {"id":1,"jsonrpc":"2.0","error":null,"result":{"status":"OK"}}
[2018-10-20 15:00:54] miner_result: Pool accepted result 0x00000905
[2018-10-20 15:01:56] hashrate: GPU0: 0 H/s [BUS:1]
[2018-10-20 15:01:56] hashrate: GPU1: 828 H/s [BUS:2]
[2018-10-20 15:01:56] hashrate: GPU2: 834 H/s [BUS:3]
[2018-10-20 15:01:56] hashrate: GPU3: 830 H/s [BUS:4]
[2018-10-20 15:01:56] hashrate: GPU4: 830 H/s [BUS:5]
[2018-10-20 15:01:56] hashrate: GPU5: 829 H/s [BUS:6]
[2018-10-20 15:01:56] hashrate: GPU6: 828 H/s [BUS:9]
[2018-10-20 15:01:56] hashrate: GPU7: 1022 H/s [BUS:10]
[2018-10-20 15:01:56] hashrate: GPU8: 907 H/s [BUS:12]
[2018-10-20 15:01:56] hashrate: GPU9: 826 H/s [BUS:13]
[2018-10-20 15:01:56] hashrate: GPU10: 890 H/s [BUS:14]
[2018-10-20 15:01:56] hashrate: GPU11: 907 H/s [BUS:15]
[2018-10-20 15:01:56] hashrate: Total: 9531 H/s
[2018-10-20 15:02:11] watchdog: GPU0 [BUS: 1] hashing speed is 0 H/S