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Nicehash legacy miner keeps crashing. Locks the entire system up forcing me to drive 20 minutes (one way) to manually restart it.

Specs:

XFX AMD Radeon RX 580 8 Gig cards x 7
Asus Z270-A motherboard
Dual EVGA 1000w power supplies
AMD Blockchain drivers
The GPU's are all running on stock settings, no over clocking or any modding. Figured I wanted to get the rig 100% stable before I tried any overclocking.

I had been running only four RX 580's on Nicehash and had it working pretty well (stable at least). Yesterday afternoon I put in new power supplies and added three additional RX 580's.  Now Nicehash is locking up/crashing every couple of hours. Thinking it might be a problem when changing algorithms I tried disabling them all except for equihash and it just locked up again!

The only thing I can find in the log file that might be an issue is:

[ComputeDeviceManager.Query] CudaDevicesDetection found no devices. CudaDevicesDetection returned: CUDA error in func 'CudaDetection::QueryDevices' at line 17 : CUDA driver version is insufficient for CUDA runtime version.


To complicate things further, most of the cards get about a 300 h/s rate but about 50% of the time GPU 6 will only have a 150 or 200 h/s. I've tried replacing the PCI-E riser with no difference.  When I run Claymore miner for intense coin, all 7 GPU's get about 620-650 h/s.

I'm not really sure what else I can do or try at the moment to fix the problem with Nicehash. Can anyone recommend a more stable but equally profitable mining program & pool I can point these GPU's to?  Tried of driving across down tonight so I just ran the ITNS Claymore miner but that will only make me about $7 bucks per 24 hours and seems like a waste of resources for  7 RX 580s. Luckily I get free power (why it's across town) but still.