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通信エラーがおおいとき確認してみてください。
（１）がんばってコマンドプロンプトを表示
ＯＳ別に表示方法が違いますので、ぐぐってください。

（２）netstat -sと入力して実行してください。
こんな感じに出ると思います。

>netstat -s

IPv4 Statistics

  Packets Received                   = 57584
  Received Header Errors             = 0
  Received Address Errors            = 0
  Datagrams Forwarded                = 0
  Unknown Protocols Received         = 0
  Received Packets Discarded         = 117
  Received Packets Delivered         = 57467
  Output Requests                    = 43641
  Routing Discards                   = 0
  Discarded Output Packets           = 10
  Output Packet No Route             = 0
  Reassembly Required                = 0
  Reassembly Successful              = 0
  Reassembly Failures                = 0
  Datagrams Successfully Fragmented  = 0
  Datagrams Failing Fragmentation    = 0
  Fragments Created                  = 0

ICMPv4 Statistics

                            Received    Sent
  Messages                  0           5
  Errors                    0           0
  Destination Unreachable   0           5
  Time Exceeded             0           0
  Parameter Problems        0           0
  Source Quenches           0           0
  Redirects                 0           0
  Echos                     0           0
  Echo Replies              0           0
  Timestamps                0           0
  Timestamp Replies         0           0
  Address Masks             0           0
  Address Mask Replies      0           0

TCP Statistics for IPv4

  Active Opens                        = 1278
  Passive Opens                       = 2
  Failed Connection Attempts          = 4
  Reset Connections                   = 30
  Current Connections                 = 10
  Segments Received                   = 52347
  Segments Sent                       = 38305
  Segments Retransmitted              = 14

UDP Statistics for IPv4

  Datagrams Received    = 5115
  No Ports              = 10
  Receive Errors        = 0
  Datagrams Sent        = 5251

IPv6は無理に殺しているので、上の例では出ていませんが、多くの方は出ていると思います。

Error、Discarded、Failuresって言葉がある項目のカウントがどんどんあがってるとかあれば怪しいです。