Hi theoneandonly23,
Welcome to the Apple Support Communities! I'm sorry to hear that you are having this issue again with your iPhone. If this missing vibration issues has happened the same way across multiple phones and is temporarily fixed by restarting your device, it is most likely a software or settings/data issue. You may want to make sure you have a current backup of your data, then try reinstalling a fresh copy of iOS as outlined in the following article (the article is aimed at a slightly different issue, but the steps listed are useful more generally):
You might see the Apple logo or a red or blue screen for a long time during start up. Try these steps:
- Connect your device to a computer and open iTunes. If you don't have a computer, you can borrow one, or go to an Apple Retail Store or Apple Authorized Service Provider for help.
- While your device is connected, force it to restart. Press and hold the Sleep/Wake and Home buttons at the same time. Don't release when you see the Apple logo. Keep holding until you see the Recovery mode screen.
- When you get the option to restore or update, choose Update. iTunes will try to reinstall iOS without erasing your data.
iTunes will download the software for your device. If it takes more than 15 minutes, your device will exit recovery mode and you'll need to repeat steps 2 and 3 again.
If your iPhone, iPad, or iPod touch doesn't respond or won't turn on - Apple Support
If the issue persists, you may then want to try restoring your iPhone to factory setting, then testing it in that state for at least a couple of days without restoring any of your data or settings. You may find this article helpful as well:
Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings - Apple Support
Regards
