The phrase "a separate problem of" is correct and usable in written English.
It can be used when discussing an issue that is distinct from another issue being addressed.
Example: "While we have made progress on the main project, there remains a separate problem of resource allocation that needs to be resolved."
Alternatives: "an independent issue of" or "a distinct matter of".
And the base took care of a separate problem: the government of Djibouti, where the military was basing its drone operations in the region, put tight restrictions on any lethal operations carried out from its soil.
In order to avoid this problem, Michael Ayers has proposed that we must understand the notions of 'substratum' and 'substance in general' in terms of Locke's doctrine of real essences developed in Book III of the Essay rather than as a separate problem from that of knowing real essences.
A separate problem is the heaviness of some of Mr. Krakoff's coats, which he made central to the collection.
Thus, Rousseau regards inequality not as a separate problem but as one of the features of the long process by which men become alienated from nature and from innocence.
Education about depression (e.g. that the symptoms of depression were a separate problem from the cancer and of the probable effectiveness of treatment).
These patients also received the nurse-delivered intervention, which comprised: Education about depression (e.g. that the symptoms of depression were a separate problem from the cancer and of the probable effectiveness of treatment).
The piracy epidemic is not so much a separate problem as a symptom of the failed state of Somalia — a place crawling with guns, gangs and criminals that has not had a functioning central government since 1991.
However, we consider the correction of such punctuation errors as a separate problem outside the scope of this study.
Robust image de-noising strategies can, of course, be employed in practice to increase the accuracy of atomic column detection by the LoG detector, but this was not performed here as the de-noising constitutes a separate problem from the focus of this paper, and is well covered in both electron microscopy and image recognition literature.
For the most part, each figure is a separate problem; most Chavin compositions consist of a single principal figure which stands or acts alone, although it may have smaller subsidiary figures associated with it.
