hi all !  need help.

[2018-06-27 19:15:25] Starting on stratum+tcp://xzc.f2pool.com:5740
[2018-06-27 19:15:25] GPU monitoring enabled.
[2018-06-27 19:15:25] 8 miner threads started, using 'lyra2z' algorithm.
[2018-06-27 19:15:27] New difficulty: 0.499992 (0.00195)
[2018-06-27 19:15:27] lyra2z block 93435, diff 22720.741
[2018-06-27 19:15:27] GPU#2: Intensity set to 17, 131072 cuda threads
[2018-06-27 19:15:27] GPU#1: Intensity set to 17, 131072 cuda threads
[2018-06-27 19:15:27] GPU#3: Intensity set to 17, 131072 cuda threads
[2018-06-27 19:15:27] GPU#5: Intensity set to 17, 131072 cuda threads
[2018-06-27 19:15:27] GPU#7: Intensity set to 17, 131072 cuda threads
[2018-06-27 19:15:27] GPU#4: Intensity set to 17, 131072 cuda threads
[2018-06-27 19:15:27] GPU#0: Intensity set to 17, 131072 cuda threads
[2018-06-27 19:15:27] GPU#6: Intensity set to 17, 131072 cuda threads
[2018-06-27 19:15:35] Stratum connection interrupted
[2018-06-27 19:15:37] lyra2z block 93435, diff 22720.741
[2018-06-27 19:15:37] Stratum connection interrupted
[2018-06-27 19:15:40] Stratum connection interrupted
[2018-06-27 19:15:42] Stratum connection interrupted
[2018-06-27 19:15:44] Stratum connection interrupted
[2018-06-27 19:15:47] Stratum connection interrupted
root@GTX1:~# ping xzc.f2pool.com
PING xzc.f2pool.com (218.11.2.44) 56(84) bytes of data.
64 bytes from 218.11.2.44: icmp_seq=1 ttl=36 time=180 ms
64 bytes from 218.11.2.44: icmp_seq=2 ttl=36 time=179 ms
64 bytes from 218.11.2.44: icmp_seq=3 ttl=36 time=189 ms
64 bytes from 218.11.2.44: icmp_seq=4 ttl=36 time=176 ms
64 bytes from 218.11.2.44: icmp_seq=5 ttl=36 time=178 ms
64 bytes from 218.11.2.44: icmp_seq=6 ttl=36 time=179 ms
64 bytes from 218.11.2.44: icmp_seq=7 ttl=36 time=189 ms
64 bytes from 218.11.2.44: icmp_seq=8 ttl=36 time=189 ms
64 bytes from 218.11.2.44: icmp_seq=9 ttl=36 time=189 ms
64 bytes from 218.11.2.44: icmp_seq=10 ttl=36 time=189 ms

./t-rex -a lyra2z -o stratum+tcp://xzc.f2pool.com:5740 -u aEjfFUmLMc2GeCPXXXXXXXXXXXXXXXXXX.gtx -p x