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 10:21:49 10:28:56 10:36:51 10:38:01 Oct 1 2 Oct 1, 2016 2 instances 11:17:42 11:20:06 4 3 Oct 4, 2016 3 instances 03:24:02 03:36:59 04:34:39 Nov Dec 30