"sporadic progress" is correct and can be used in written English.
It typically means progress that occurs irregularly or in scattered instances. Example: Despite many setbacks, the project has seen sporadic progress over the past few months.
Other companies have made sporadic progress.
Since then there has been sporadic progress in building this kind of computer.
While Iraqi troops, peshmerga forces and Shiite militiamen are making sporadic progress, they are unlikely to attempt to recapture the strategic northern city of Mosul until well into next year.
Yet despite broad if sporadic progress, the United Nations acknowledges that only two of the many targets might actually be met: cutting in half the number of people who lack safe drinking water and halving the number of people who live on $1.25 or less daily.
Earlier studies have shown that inherited and sporadic tumors progress along different somatic genetic pathways and that global gene expression profiles distinguish between these groups.
The percentage of Tregs was decreased in rapidly progressing patients with sporadic ALS compared with slowly progressing patients with sporadic ALS.
For now, such progress is sporadic.
But it was not just other cars impeding the Audi's progress, with sporadic showers affecting proceedings inside the final three hours.
Outside the embassy, a small red brick apartment block behind Harrods department store in the upscale Knightsbridge neighborhood, a protester with a megaphone provided sporadic updates on the progress of the news conference in Quito.
On the night of 27 28 February 1917, Michael attempted to return to Gatchina from Petrograd, where he had been in conference with Rodzianko and from where he had telegraphed the Tsar, but revolutionary patrols and sporadic fire prevented his progress.
That technological progress, though, was sporadic.
