The phrase "a solid fix" is correct and usable in written English.
It can be used to describe a reliable or effective solution to a problem or issue.
Example: "After reviewing the situation, we believe that implementing the new software will provide a solid fix for our data management issues."
Alternatives: "a reliable solution" or "an effective remedy".
Let's put vouchers on the table and then once we do that, let's put a solid fix on the system.
Finally, to determine how much, you'll need a solid fix on which areas of the enterprise require the developmental benefits of mobility.
Self-tanner delivers that extra-melanated look you love, and it lasts a few days — a solid fix for monthslong seasonal color loss.
Meet in person, and get a solid fix on what's involved in their work.
The update should bring with it a solid fix for the "unexpected restart" issue, which probably should have been handled a couple weeks after the phone's launch.
This is a solid fix that keeps in place the protections for true victims of human trafficking while clearing the backlog of those who would not qualify for refuge.
While film is fluid — forward motion, wrapped in light — the stage is a solid, fixed in front of us; whatever you put on it has to stand there with the irrefutable weight of fact.
The magazine's Greg Ford, who provided the third review, said that its "style, cut-scenes, and story are all great, [but] the actual gameplay is pretty mundane"; he concluded, "But if all you need is a solid shooter fix, XIII will do just fine.
A new hydrocyclone was designed with a solid core fixed along the central axis in this study.
For this purpose, mycoplasmas were grown directly on a solid surface, fixed and examined by scanning electron microscopy (Fig. 6A F).
In one patient, we reconstructed a lateral rim deficiency without impaction grafting using a solid autograft fixed with two screws.
