Completely locks up system.
It gets a very nice hash rate while I'm running it, however, when I'm running it, I cannot use the computer at all. My current configuration looks like this:
```json
{
    "algo": "cryptonight",
    "background": false,
    "colors": true,
    "donate-level": 1,
    "log-file": null,
    "print-time": 60,
    "retries": 5,
    "retry-pause": 5,
    "syslog": false,
    "threads": [
        {
            "index": 0,
            "threads": 14,
            "blocks": 66,
            "bfactor": 0,
            "bsleep": 0,
            "affine_to_cpu": false
        }
    ],
    "pools": [
        {
            "url": "uspool.electroneum.com:7777",
            "user": "etnkQEeyXL1hHqYSPj7RzFKcpowXnuj2wedTf8Hm1erT4U1ZqFoTPNeHamnrVKPcVqhH8fCUAm6hy2D88JHWEUqE2X2pd3QuSJ",
            "pass": "x",
            "keepalive": true,
            "nicehash": true
        }
    ],
    "api": {
        "port": 0,
        "access-token": null,
        "worker-id": null
    }
}
```
What option should I change in order to fix this?