The Ministry of Justice is rushing to fix IT issues affecting courts across England.
Lawyers say trials have been delayed, jurors are unable to enrol and witness statements are inaccessible.
Twitter user @BarristerSecret said the "entire digital infrastructure" of courts had been "broken for days".
The Common Platform, a system shared between the police, the courts and the Crown Prosecution Service (CPS), was updated last June at a cost of £1 billion.
The Ministry of Justice (MoJ) says the problems have "nothing to do" with that system.
In a statement the MoJ said: "We apologise to those who have been affected by the network issues that we have been experiencing over recent days. The urgent work we have been carrying out with our suppliers has led to significant improvements today, but this work is ongoing and we have contingency plans in place.
"While services have continued to operate and alternative network access is now in place for most, we know how frustrating this is for anyone affected and we are disappointed that our suppliers haven't yet been able to resolve the network problems in full. We continue to work with them to return services to normal."
The disruption continues to "cause chaos" reports The Law Society Gazette.
Chris Henley QC, who chairs the Criminal Bar Association, told The Law Society Gazette: "Short-term savings often result in wider costs to the public purse and cause a broken criminal justice system to fall further apart, reports BBC.
"Crumbling court buildings are bad enough for court users - both the public and criminal practitioners - but digital failures can have far more profound consequences for all those awaiting trial."
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