i have a problem for monero mining using Claymore's GPU miner

log is below

10:47:50:012   d0c   06/30/17-10:47:50 - New job received from xmr.pool.minergate.com:45560
10:47:50:013   d0c   Speed: 400 h/s, Total Shares: 82, Rejected: 0, Mining time:
10:47:50:014   d0c   00:04
10:47:50:015   d0c   TotalHashes: 101K, DevHashes: 1K, DevFee rate is 1:39
10:47:50:151   f68   Job changed, drop current round
10:47:50:153   c2c   Job changed, drop current round
10:47:50:153   c2c   Round
10:47:51:436   f68   GPU 0: HashCnt = 512, time = 1267 ms, hashrate = 404 h/s
10:47:51:451   f68   Round
10:47:52:752   c2c   GPU 0: HashCnt = 512, time = 1273 ms, hashrate = 402 h/s
10:47:52:757   c2c   Round
10:47:54:045   f68   GPU 0: HashCnt = 512, time = 1265 ms, hashrate = 404 h/s
10:47:54:050   f68   Round
10:47:55:350   c2c   GPU 0: HashCnt = 512, time = 1276 ms, hashrate = 401 h/s
10:47:55:354   c2c   Round
10:47:56:643   f68   GPU 0: HashCnt = 512, time = 1265 ms, hashrate = 404 h/s
10:47:56:647   f68   round found 1 shares
10:47:56:648   d0c   06/30/17-10:47:56 - SHARE FOUND (target 3839) - (GPU 0 of 1)
10:47:56:648   f68   Round
10:47:56:648   d0c   send: {"method": "submit", "params": {"id": "7b196c7b-094d-4cac-ba2e-89f50e1a3c30", "job_id": "bf9b3127-3319-49aa-a1ba-0b785a5956e6", "nonce": "660b0000", "result": "cd708467388889b53bb480a78e5a27b48de20c0f50a9ceb3f25ec95462b50700"}, "id":4}

10:47:56:893   d0c   got 63 bytes
10:47:56:893   d0c   buf: {"jsonrpc":"2.0","result":{"status":"OK"},"id":4,"error":null}

10:47:56:894   d0c   parse packet: 63
10:47:56:895   d0c   Share accepted (250 ms)!
10:47:56:896   d0c   new buf size: 0
10:47:57:660   938   got 73 bytes
10:47:57:660   938   buf: {"jsonrpc":"2.0","error":{"code":-42,"message":"Timeout"},"result":null}

10:47:57:660   938   parse packet: 73
10:47:57:660   938   cannot find block data:
10:47:57:660   938   {"jsonrpc":"2.0","error":{"code":-42,"message":"Timeout"},"result":null}
10:47:57:660   938   cannot convert blob data
10:47:57:660   938   new buf size: 0
10:47:57:682   938   socket was closed remotely
10:47:57:682   938   DevFee:  Connection lost, retry in 20 sec...
10:47:57:943   c2c   GPU 0: HashCnt = 512, time = 1274 ms, hashrate = 401 h/s
10:47:57:943   c2c   Round
10:47:58:393   2f0   GPU0 t=68C fan=55%
10:47:58:394   2f0   watchdog - thread 0, hb time 1750
10:47:58:394   2f0   watchdog - thread 1, hb time 453
10:47:59:241   f68   GPU 0: HashCnt = 512, time = 1269 ms, hashrate = 403 h/s
10:47:59:246   f68   Round
10:48:00:529   c2c   GPU 0: HashCnt = 512, time = 1269 ms, hashrate = 403 h/s
10:48:00:529   c2c   Round
10:48:01:837   f68   GPU 0: HashCnt = 512, time = 1272 ms, hashrate = 402 h/s


what is the error code -42?

what's happen to my miner....?

i use minergate pool whose address is xmr.pool.minergate.com:45560

The error happens sometimes..

how can i resolve this problem?

plz help me....