On one of the biggest shopping days of the year for Amazon.com the company\u2019s web site crapped out intermittently for hours yesterday.\nInstead of Prime Day purchases, many customers just got error messages and pictures of the dogs of Amazon, along with a message from Amazon that read: "Sorry, we're experiencing unusually heavy traffic. Please try again in a few seconds. Your items are still waiting in your cart," or \u201c"Uh-Oh. Something went wrong on our end."\n\nPrime Day started at 3 p.m. ET, and the problems emerged almost immediately after.\u00a0 Around 5 p.m., Amazon tweeted acknowledgement of the problem stating: \u201cSome customers are having difficulty shopping and we are working to resolve this issue quickly.\u00a0 Many are shopping successfully \u2013 in the first hour of Prime day in the US, customers have ordered more items compared to the first hour last year.\u201d\nThe website Downdetective.com reported that most reported problems came from Amazon\u2019s Website (39%), Log-in (34%) \u00a0and Check-out (25%) activities. The site also shows most problems were resolved by 5 or 6 p.m. ET.\u00a0\nSo far, Amazon has not said what the cause of the outage was \u2013 some posted about a possible DDOS attack\u00a0 \u2013 but it seems the company\u2019s web servers just weren\u2019t up to the task, despite the company having a year between Prime Days to build up resources\nNetwork-analysis provider ThousandEyes said it detected no ISP outages or content-delivery-network provider errors that might explain the problem, and it also ruled out an overwhelming DDoS attack. \u201cWhat we did see were application layer errors, which tells us that this was most likely an issue in the web server or a backend API call,\u201d according to a statement by a ThousandEyes\u2019 product manager, Archana Kesavan. \u201cThis appears to be an internal Amazon application issue."\n.\nOne Twitter poster said:\n\u201cWhat everyone's not realizing about the @amazon outage is that assuming they have 10 million customers browsing at the same time and an average page size of 5MB, the total bandwidth used is 50,000GB\/s, or 50TB\/s (aka 1,000x Blu-Ray movies-worth each second).\u201d\nPrime Day is a big deal for Amazon with some predicting the online giant will make about $4 billion this year on this day alone. Last year the company made between $1 billion to $3 billion or so depending on whose research you read.