12 instances from 2 years 2017 - 2 instances Jan 7 Feb 3 Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2016 - 10 instances Jan Feb Mar Apr May Jun Jul Aug Sep 20 4 Sep 20, 2016 4 instances 10:23:57 10:31:05 10:38:59 10:40:08 Oct 1 2 Oct 1, 2016 2 instances 12:05:38 12:08:33 4 3 Oct 4, 2016 3 instances 04:13:08 04:25:37 05:22:16 Nov Dec 30