[Device 0] Average speed (5s): 12551.9 sol/s
[Device 1] Average speed (5s): 7562.11 sol/s
[Device 2] Average speed (5s): 7417.15 sol/s
[Device 3] Average speed (5s): 12431.9 sol/s
I have seen this only twice yet - on Ubuntu systems - but could be the same reasons. Can you have a look how much your system load is? It seems this happens when the miner does not get enough CPU time to load all cards with their task all of the time. One solution could be to manually set the priority of the miner to "higher" - this solved it for the one guy.
The second case was in my own testing system - a 1080 starting at 19k sol and then after some time dropping to 14.5k while the 2nd card still working at high rate. Here the slower card went so hot that it was thermal throttling. Open the case and allowing higher fan speed solved this. Whats the output of nv-smi when your cards are running?
Thank you.
Will try with CPU.
Sory for stupid question, but what is nv-smi? If you mean temperatures - it's <60C.