The phrase "another issue could be" is correct and usable in written English.
You can use it when introducing a different problem or concern that may arise in a discussion or analysis.
Example: "While we have addressed the main concerns, another issue could be the budget constraints affecting the project timeline."
Alternatives: "another concern might be" or "an additional problem could be".
Another issue could be whether Mr. Sumter was so concerned for the safety of his son that he lost control, possibly lending justification to his act.
Another issue could be that since existing firms aren't motivated to hire new and cheap workers, new firms are needed to absorb jobless workers, but new firm creation is hampered by tight credit conditions.
Another issue could be that we used topical anesthetics (EMLA cream) to anesthetize the skin before insertion of the microdialysis catheter, which possibly might influence the interstitial muscle levels of biomarkers.
Another issue could be the unwillingness of the user to wear an unusual device, or even perceive it as a personal stigma indicating to friends and family members that they require help.
Another issue could be Medicare, a program popular with Trump voters and one that Trump once vowed to protect.
Another issue could be the size of game studios these days: a case of too many cooks spoiling the comedy broth, perhaps?
Another possible issue could be that of information overload.
Another methodological issue could be consensus interpretation in imaging research [ 15].
Another potentially thorny issue could be the public schools' fourth-grade health curriculum, which includes discussions of sexual reproduction.
Should the recession end quickly -- if this one is of average length, it will be over in another month -- the issue could be neutralized, leaving the political landscape dominated by President Bush's stratospheric approval ratings.
Another issue for anti-aviation campaigners is that the issue could be dropping off the wider climate movement's radar.
