Monitoring stations timeout to our NTP servers

i have the same problem here in italy but only from isp fastweb and tiscali
ipv4 score floating 10/14
ipv6 score 20

from isp wind i have
ipv4 score 20
ipv6 score 20

1565817537,"2019-08-14 21:18:57",0.00379887,1,7.3,,,0,
1565816626,"2019-08-14 21:03:46",0,-5,6.6,6,"Newark, NJ, US",,"i/o timeout"
1565816626,"2019-08-14 21:03:46",0,-5,6.6,,,,"i/o timeout"
1565815642,"2019-08-14 20:47:22",0.001398844,1,12.3,6,"Newark, NJ, US",0,
1565815642,"2019-08-14 20:47:22",0.001398844,1,12.3,,,0,
1565814669,"2019-08-14 20:31:09",0.001399639,1,11.9,6,"Newark, NJ, US",0,
1565814669,"2019-08-14 20:31:09",0.001399639,1,11.9,,,0,
1565813742,"2019-08-14 20:15:42",0.002030171,1,11.4,6,"Newark, NJ, US",0,
1565813742,"2019-08-14 20:15:42",0.002030171,1,11.4,,,0,
1565812824,"2019-08-14 20:00:24",0.002168236,1,11,6,"Newark, NJ, US",0,
1565812824,"2019-08-14 20:00:24",0.002168236,1,11,,,0,
1565811916,"2019-08-14 19:45:16",0.002224739,1,10.5,6,"Newark, NJ, US",0,
1565811916,"2019-08-14 19:45:16",0.002224739,1,10.5,,,0,
1565810982,"2019-08-14 19:29:42",0.001927572,1,10,6,"Newark, NJ, US",0,
1565810982,"2019-08-14 19:29:42",0.001927572,1,10,,,0,
1565809981,"2019-08-14 19:13:01",0.002043029,1,9.5,6,"Newark, NJ, US",0,
1565809981,"2019-08-14 19:13:01",0.002043029,1,9.5,,,0,
1565808980,"2019-08-14 18:56:20",0.001458194,1,8.9,6,"Newark, NJ, US",0,
1565808980,"2019-08-14 18:56:20",0.001458194,1,8.9,,,0,
1565808019,"2019-08-14 18:40:19",0.001889322,1,8.3,6,"Newark, NJ, US",0,
1565808019,"2019-08-14 18:40:19",0.001889322,1,8.3,,,0,
1565807110,"2019-08-14 18:25:10",0,-5,7.7,6,"Newark, NJ, US",,"i/o timeout"
1565807110,"2019-08-14 18:25:10",0,-5,7.7,,,,"i/o timeout"