I did a quick check of the access.log for the period and found we were getting 'hits' to the website at fairly customary rates: Date Time Hits
08/Oct/2014 15:00 920
08/Oct/2014 15:10 868
08/Oct/2014 15:20 775
08/Oct/2014 15:30 968
08/Oct/2014 15:40 717
08/Oct/2014 15:50 917
08/Oct/2014 16:00 383
08/Oct/2014 16:10 788
08/Oct/2014 16:20 508
08/Oct/2014 16:30 635
08/Oct/2014 16:40 624
08/Oct/2014 16:50 489
08/Oct/2014 17:00 416
08/Oct/2014 17:10 333
08/Oct/2014 17:20 367
08/Oct/2014 17:30 303
08/Oct/2014 17:40 618
08/Oct/2014 17:50 1159
08/Oct/2014 18:00 874
08/Oct/2014 18:10 669
08/Oct/2014 18:20 602
08/Oct/2014 18:30 519
08/Oct/2014 18:40 657
08/Oct/2014 18:50 441
08/Oct/2014 19:00 488
08/Oct/2014 19:10 502
08/Oct/2014 19:20 500
08/Oct/2014 19:30 519
08/Oct/2014 19:40 353
08/Oct/2014 19:50 372
08/Oct/2014 20:00 595
08/Oct/2014 20:10 378
08/Oct/2014 20:20 594
08/Oct/2014 20:30 675
08/Oct/2014 20:40 577
08/Oct/2014 20:50 428
08/Oct/2014 21:00 401
08/Oct/2014 21:10 284
08/Oct/2014 21:20 454
08/Oct/2014 21:30 339
08/Oct/2014 21:40 844
08/Oct/2014 21:50 1210
08/Oct/2014 22:00 1172
08/Oct/2014 22:10 1223
08/Oct/2014 22:20 898
08/Oct/2014 22:30 1205
08/Oct/2014 22:40 990
08/Oct/2014 22:50 979
08/Oct/2014 23:00 1057
08/Oct/2014 23:10 999
08/Oct/2014 23:20 959
08/Oct/2014 23:30 1024
08/Oct/2014 23:40 849
08/Oct/2014 23:50 1026
so there was likely a DNS disturbance causing the access issue.
Edit.. replaced analysis with updated copy.