iPhone 5s became slow and buggy after iOS 9.1 update , what can I do ? i already resetted my phone by the way it still the same thing and then sometimes the spotlight suggestion box is always getting stucked on the status bar . whislt multitasking th

Hello bashman_

If your iPhone is running slowly and the Spotlight app is getting stuck, it sounds like the update to iOS 9.1 may not have completed. If you have already restarted the iPhone and did a Force Restart as well, then I would suggest backing up the device and trying to Update the iOS software vs. Restore the device. Check out the resources below:

Restart your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT201559

iCloud: Back up your iOS device to iCloud
https://support.apple.com/kb/PH12520?locale=en_US

If you can‘t update or restore your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT201263

Put your device in recovery mode and set it up again

1. Connect your device to your computer and open iTunes. If you don't have a computer, borrow one from a friend or go to an Apple Retail Store or Apple Authorized Service Provider for help.
2. While your device is connected, force restart it: Press and hold both the Sleep/Wake and Home button for at least 10 seconds, and don't release when you see the Apple logo. Keep holding until you see the recovery mode screen.
   
   
   
3. When you see the option to Restore or Update, choose Update. iTunes will try to reinstall iOS without erasing your data. Wait while iTunes downloads the software for your device.
   If the download takes more than 15 minutes and your device exits recovery mode, you'll need to repeat these steps and choose Restore instead of Update when you get back to this step.
   
4. After the Update or Restore completes, set up your device. If you previously backed up your device with iTunes or iCloud and had to restore your device in step 3, you might be able to restore from your backup during setup.

Hope this helps ...