Thousands of students and staff returning to term two at South Australian schools have been left in the lurch after remote learning software failed to cope with an influx in demand, but the State Government has brushed off issues.

Key points: South Australia's online learning system crashed for some users due to demand

South Australia's online learning system crashed for some users due to demand Mother Kristy Schirmer will send her sons back to school as a result of the software issues

Mother Kristy Schirmer will send her sons back to school as a result of the software issues The Education Department described the problem as "a little fault"

Several schools posted messages to students and parents on social media, noting "ICT issues" with the system, dubbed LearnLink.

A State Opposition representative claimed the system was being overloaded and had crashed for some.

Among the schools reporting problems were both regional and metropolitan primary and high schools across the state.

"The Education Department are currently having intermittent issues with the LearnLink login system which affects access to Teams," Nuriootpa High School posted on Facebook.

"We are awaiting a resolution from the department on this issue. In the meantime please keep trying to login to Teams to access your class information and online Zoom meetings.

"If you miss your meeting due to ICT issues, don't panic, please ask a parent/carer to contact the teacher via Daymap so that your attendance can be marked accordingly."

'We can't carry on with online learning'

Kristy Schirmer's sons had been learning from home for the last month of term one and were prepared for a couple more weeks of virtual learning, starting today.

But after struggling with the login system continually crashing this morning, she has made the decision to send them back to the classroom tomorrow.

"I think we were optimistic it would work after expecting that online learning would be available," she said.

"It's just another challenge of being home."

Kristy Schirmer helps her son, year four student Campbell Howlum, as he studies. ( ABC News: Shuba Krishnan )

Health authorities have been urging parents and carers to send their children to school — but they still have the option of keeping children home, where they can access online learning.

LearnLink is being used to help students connect to virtual classrooms.

The Education Department's Rick Persse said it was a minor issue.

"It was just an intermittent little fault, it was basically that people were logging in and not getting a secure connection, it would've been frustrating but not fatal," Mr Persse said.

"As far as we're aware now, all the problems have been resolved and everything is back to normal."

Labor criticises department's preparation

Ms Schirmer said while she understood everyone was doing their best, it was frustrating when the software failed.

"We've basically been winging it today in the absence of having any other online learning," she said.

"As the day progressed, we've been given extra tasks, but with everyone back at school … it just feels like we can't carry on at home with online learning."

South Australia's Education Minister, John Gardner, expected the majority of students would return to face-to-face learning this term.

"We're certainly anticipating a majority of our students to be back at school, potentially a significant majority, which is quite different to a couple of weeks ago when rates of community transmission were higher," he said.

Exact figures on attendance are expected later in the week.

Deputy Labor leader Susan Close said the State Government had plenty of time to get the online learning platform up to scratch.

"We needed term two to start as well as possible and because the Government hasn't got their technology sorted out it is yet another problem for families," Ms Close said.

"Families have been facing a very difficult question about whether to send their children to school or not, this is a stressful time anyway and this has just made it worse."