A. 1. Clear the app cache: Go to Settings > General > iPhone Storage, find Napper, and tap on it. If there’s an option to 'Offload App', do that to clear temporary files without deleting your data. Reinstall the app afterward.
2. Restart your iPhone: Sometimes, a simple restart can help improve performance. Press and hold the power button until you see the slider, then slide to power off. Turn it back on after a few seconds.
B. 3. Check for background apps: Close any unnecessary apps running in the background that may be consuming resources. Follow the same steps as in the first solution to close them.