I am having a problem with one of my rigs it is crashing all the time (sometimes I have to disconnect the power to all GPUs, uninstall the onboard graphics, and then connect the power to all cards again before rebooting the PC to get the PC to boot, and sometimes I even get THREAD_STUCK_IN_DEVICE_DRIVER error message when trying to boot the PC), and I did find out that if I turn off GPU 5 it seems to work better and not crashing.
I am running in Windows 10 x64 with Sappire Radeon RX 480, and I did try different drivers without any luck. And I got the same clock settings on all cards (I am running 4 more RX480 on another machine and that one did not crash one single time in over 3 weeks) This is how the logfile looks right before the crash if I run with GPU 5 on...


02:27:22:161   11f0   ETH: GPU0 27.335 Mh/s, GPU1 27.361 Mh/s, GPU2 27.348 Mh/s, GPU3 27.288 Mh/s, GPU4 27.351 Mh/s, GPU5 0.000 Mh/s
02:27:22:166   11f0    DCR - Total Speed: 2733.663 Mh/s, Total Shares: 319, Rejected: 4
02:27:22:171   11f0    DCR: GPU0 546.709 Mh/s, GPU1 547.214 Mh/s, GPU2 546.966 Mh/s, GPU3 545.762 Mh/s, GPU4 547.012 Mh/s, GPU5 0.000 Mh/s
02:27:22:446   ca0   DCR: weak share, skip
02:27:23:291   6ac   DCR: weak share, skip
02:27:23:761   408   GPU0 t=59C fan=44%, GPU1 t=84C fan=61%, GPU2 t=79C fan=53%, GPU3 t=79C fan=58%, GPU4 t=85C fan=61%, GPU5 t=85C fan=60%
02:27:23:766   408   em hbt: 0, dm hbt: 0, fm hbt: 0,
02:27:23:766   408   watchdog - thread 0, hb time 203
02:27:23:771   408   watchdog - thread 1, hb time 94
02:27:23:771   408   watchdog - thread 2, hb time 0
02:27:23:771   408   watchdog - thread 3, hb time 125
02:27:23:776   408   watchdog - thread 4, hb time 31
02:27:23:776   408   watchdog - thread 5, hb time 141
02:27:23:781   408   watchdog - thread 6, hb time 219
02:27:23:781   408   watchdog - thread 7, hb time 110
02:27:23:786   408   watchdog - thread 8, hb time 94
02:27:23:786   408   watchdog - thread 9, hb time 203
02:27:23:791   408   watchdog - thread 10, hb time 77656
02:27:23:791   408   WATCHDOG: GPU 5 hangs in OpenCL call, exit
02:27:23:796   408   watchdog - thread 11, hb time 77547
02:27:23:801   408   WATCHDOG: GPU 5 hangs in OpenCL call, exit
02:27:24:806   408   Restarting OK, exit...





This is how my *.bat file looks

setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
EthDcrMiner64.exe -epool eth-eu.dwarfpool.com:8008 -ewal 0xMyEtherWalletAddress -epsw x -eworker miner2 -dpool stratum+tcp://dcr.coinmine.pl:2222 -dwal MyUsername.miner2 -dpsw MyPassword -dcri 40



What can be wrong, any advice?