proxy kicks out slow miners every minute
My understanding is that xmrig author does NOT recommend using `--custom-diff` on the proxy side. So I am not using that. But this is causing very high difficulty jobs to arrive to the miner (xmr-stak in this case). And I find that the proxy kicks away the miner every one minute or a little more (see xmr-stak log below).

Since kicking away the miner and reconnecting every minute is not very efficient, what is the recommended configuration ?

```
[2018-05-04 19:14:40] : Fast-connecting to myxmrig-proxy.com:9080 pool ...
[2018-05-04 19:14:40] : MEMORY ALLOC FAILED: mmap failed
[2018-05-04 19:14:40] : MEMORY ALLOC FAILED: mmap failed
[2018-05-04 19:14:40] : Pool myxmrig-proxy.com:9080 connected. Logging in...
[2018-05-04 19:14:40] : Difficulty changed. Now: 500054.
[2018-05-04 19:14:40] : Pool logged in.
[2018-05-04 19:14:48] : New block detected.
[2018-05-04 19:15:48] : SOCKET ERROR - [myxmrig-proxy.com:9080] RECEIVE error: socket closed
[2018-05-04 19:15:48] : All pools are dead. Idling...
[2018-05-04 19:15:58] : Fast-connecting to myxmrig-proxy.com:9080 pool ...
[2018-05-04 19:15:58] : Pool myxmrig-proxy.com:9080 connected. Logging in...
[2018-05-04 19:16:00] : Pool logged in.
[2018-05-04 19:16:06] : New block detected.
[2018-05-04 19:16:22] : New block detected.
[2018-05-04 19:17:23] : SOCKET ERROR - [myxmrig-proxy.com:9080] RECEIVE error: socket closed
[2018-05-04 19:17:23] : All pools are dead. Idling...
[2018-05-04 19:17:32] : Fast-connecting to myxmrig-proxy.com:9080 pool ...
[2018-05-04 19:17:32] : Pool myxmrig-proxy.com:9080 connected. Logging in...
[2018-05-04 19:17:34] : Pool logged in.
[2018-05-04 19:18:32] : SOCKET ERROR - [myxmrig-proxy.com:9080] RECEIVE error: socket closed
[2018-05-04 19:18:32] : All pools are dead. Idling...
[2018-05-04 19:18:42] : Fast-connecting to myxmrig-proxy.com:9080 pool ...
[2018-05-04 19:18:42] : Pool myxmrig-proxy.com:9080 connected. Logging in...
[2018-05-04 19:18:44] : Pool logged in.
[2018-05-04 19:19:13] : New block detected.
[2018-05-04 19:19:51] : New block detected.
[2018-05-04 19:20:52] : SOCKET ERROR - [myxmrig-proxy.com:9080] RECEIVE error: socket closed
[2018-05-04 19:20:52] : All pools are dead. Idling...
[2018-05-04 19:21:00] : Fast-connecting to myxmrig-proxy.com:9080 pool ...
[2018-05-04 19:21:00] : Pool myxmrig-proxy.com:9080 connected. Logging in...
[2018-05-04 19:21:02] : Pool logged in.
```
