Happens to me on occasion. If fish are rising in slow water, cast accurately and let it sit.
Occasionally it works, especially if fish are in a no holds barred frenzy. More often, a fish comes up and stares down the fly for about 2 minutes before refusing it. That's when I I realize that it ain't gonna work, too much time to inspect, and if you impart any sort of movement it's drag and it doubly ain't gonna work!
You then convince yourself that those fish in the frog water are difficult right now. You MOVE, and look for current. Spend your time in the areas with the highest probability of success. Someday, after a rain, the water that has a little current today will be an unfishable torrent, and that frog water will have a nice, fishable gentle current. That's when those dang fish will get what's comin to them!!!!
The key to catching fish is picking battles that you can win!