I have 2 rigs and I cannot determine what is wrong with dual mining on Claymore (tried versions 10.2 and 10.3 same results).

Rig 1: 2x1070 GTX FE, 2x RX 580
Rig 2: 1xRX Vega 64, 2x RX 580

Resot if it is basic CPU (intel celeron), 4 GB of RAM, simple HDD. Windows 10, Nvidia running latest drivers, AMD uses blockchain drivers. PSU EVGA 1300W

Now when mining only ETH it is fine it runs and has no issues, but when I run dual mining it will work for 15 minutes, 10 minutes 2 hours (there is no specific amount of time) and it will either freeze miner or entire OS that I have to reboot machine.

At first I thought that Rig 1 would have issues because it uses AMD and Nvidia at the same time, that doesn't matter because same issue happens on "only AMD" rig. My second thought was that because dual mining consumes a bit more resources is because I OC'ed cards. I have returned cards to default values and I have same issues. My next thought that cars are overheating, but looking at logs and monitoring cards on my own they are around 50-70C, with fan being on 40-60% (it really depend on a card), so heating is not the issue. I've read similar posts and I tried different settings for cards like:

setx GPU_MAX_ALLOC_PERCENT 100

EthDcrMiner64.exe -epool stratum+tcp://eth-eu.dwarfpool.com:8008 -ewal mywallet -esm 0 -epsw x -dcoin sia -dpool stratum+tcp://sia-eu1.nanopool.org:7777 -dwal mywallet -dcri 25 -dpsw x -ftime 10

I tried playing with dcri values, tried adding following settings:

setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_SINGLE_ALLOC_PERCENT 100

One thing that I have not confirmed is that my ETH mining is on dwarfpool, while SIA is on nanopool, but I assume there should be no difference, pool is a pool.

Nothing that I've tried worked. Does anyone have any idea what could be wrong?