Here's my story with this.
One of the registers in Electronics gets the 719 prompt for a Target Visa, they go through the wait of about 15 minutes and get the approval code, not even 5 minutes later I get a prompt at my register in Electronics. Luckily the guest I was with had a different card and just used that.
2 guests go by and another person uses a Visa card, not a Target Visa, just a regular one. And I get prompted to call 719. On hold for 26 minutes and I get Target India and the guy tells me I was supposed to call 716 and that he cannot help me, I was like I have waited on hold for almost a half an hour and the computer gave me 719 to call, I need an authorization, to which he answers I cannot help you. So now I am frustrated and am like I need to speak with a supervisor to get this resolved, and Mr India says we don't have supervisors and hangs up on me. I sit there in awe for a moment, hang up the phone and go "oh ************, really" in my head.
Thank God this guests friend showed up and used her debit card to pay for her merch. Jeeze!
I also had a few credit cards get declined and a couple that were debit/credit cards, so they were like I will try it as a debit and that went through.
Some S hit the fan and there was no urgent messages or anything by 0400 when I went to my lunch, but it was pretty much resolved by the time I got back, it seemed like it was just the first 2 hours or so. My guess is that Visa flagged all these early purchases as suspicious since they were high amounts at odd times of the night, since all of our cards that were getting declined happened to be Visa's... :-\