The phrase "a frequent challenge" is correct and usable in written English.
You can use it to describe a situation or issue that occurs often and requires effort to overcome.
Example: "Managing remote teams can be a frequent challenge for many organizations, especially when it comes to communication."
Alternatives: "a common difficulty" or "a regular obstacle."
The accurate changepoint detection of different signal segments is a frequent challenge in a wide range of applications.
Consistent production of solid drug materials of desired particle and crystallographic morphologies under cGMP conditions is a frequent challenge to pharmaceutical researchers.
A frequent challenge in these kinds of experiments and validations is the lack of a stable, reproducible and flexible biological reference material.
Imaging of the degenerative spine is a frequent challenge in radiology.
Addressing delusions presented by patients in the first meeting is a frequent challenge in acute care.
They each address problems of complexity, which is a frequent challenge in global health.
However, because of the nature of subthreshold states and consequential diagnostic and therapeutic uncertainties, subthreshold depression represents a special and frequent challenge to GPs.
Right lower quadrant pain in young females presents a frequent diagnostic challenge for emergency physicians, with a broad differential and several important diagnoses.
Differentiating acute chest pain caused by myocardial ischaemia from other, potentially more benign causes of chest pain is a frequent diagnostic challenge faced by Emergency Department (ED) clinicians.
We wanted to include a vignette with abdominal pain, a frequent diagnostic challenge, but could not find an appropriate case, and thus wrote it ourselves.
In these studies a frequent technical challenge has been the achievement of an expression stoichiometry that allowed mosaic particles with full representation of the capsid protein variants.
