no active pools, stop mining after a few jobs are submitted
I am setting up a ARM mining farm and am using a raspberry pi as xmrig-proxy host where my clients connect to 
from client side I am launching an android verson of xmrig unsing

xmrig -o 192.168.1.11:1111 --rig-id worker1  -a astrobwt --nicehash

on xmrig-proxy side I have the following setup

{
    "autosave": true,
    "cpu": true,
    "opencl": false,
    "cuda": false,
    "donate-level": 1,
    "pools": [
        {
            "algo": "astrobwt",
            "url": "dero.miner.rocks:30182",
            "user": "MY_DERO_ADDRESS",
            "pass": "w=HomeRig",
            "keepalive": true
        }
    ],
    "bind": [
    	{
    		"host": "0.0.0.0",
    		"port": 1111,
    		"tls": false
    	},
    	{
    		"host": "0.0.0.0",
    		"port": 2222,
    		"tls": false
    	},
        {
                "host": "0.0.0.0",
                "port": 3333,
                "tls": false
        }
    ]
}

the clients are able to connect and get 1 or 2 jobs from the proxy. But after a few minutes all clients get "no active pools, stop mining"

Any ideas why this is happening?