Telstra's recently troubled mobile network was tested again on Sunday as customers used a free data day - offered as compensation - to download and stream at record rates.
Customers downloaded 2,686 terabytes of data - equal to 3.4 million HD movies - up 46 per cent from 1,841 terabytes downloaded on a previous free data day offered on February 14.
Telstra, which has around 16.9 million mobile customers, has given away free unlimited data on the occasions as apologies for recent major mobile network outages.
The carrier's reputation as Australia's premier telco has been tarnished by three major network problems in the past two months.
Telstra suffered a nation-wide network outage on February 9, followed by another major outage on March 17 that left around half of its 16 million mobile customers unable to make calls or go online.
A third incident, affecting service to around 500,000 of its pre-paid customers, occurred at the start of March.
On Sunday, some customers complained via social media about slow download speeds and Telstra conceded there were "a few hot spots where heavy users caused localised congestion."
Chief operations officer Kate McKenzie said at a media briefing called on Monday that the network had performed well given the load.
"We were really pleased with the way the network performed given this absolute tsunami of data," Ms McKenzie said.
She said "traffic balancing mechanisms" were used during the day to "tune and optimise" the network and ensure all customers had an opportunity to download.
One Telstra customer boasted on social media that he downloaded 994 gigabytes of data on Sunday - a level Ms McKenzie said equates to a typical user's downloads over 40 years.
Telstra's first network outage in February - which affected about 15 per cent of the group's customers because of human error - led to a free data day on February 14.
The second outage was due to an overseas connection problem that affected international roaming customers, and then led to problems locally.
A third incident, which affected around 500,000 of its pre-paid customers losing service, occurred at the start of March.
Telecommunications analyst Paul Budde doesn't expect the recent network problems to damage Telstra's reputation if they can limit the outages and solve the problems. "They've been pretty open about everything. I don't see a reason to not believe what they are saying," Mr Budde said.
"If they can solve the underlying problems than I think in a couple of months' time, no one will remember it anymore," Mr Budde said.
Telstra expects to complete a network review within the next month, with the group recently hiring David William from information-technology provider Tech Mahindra to help with the review.
Executives from technology firms Ericsson, Cisco and Juniper Networks are also helping Telstra's own engineers with the review.
Telstra shares closed flat at $5.26.
