Hello! It seems like you're encountering a common issue where your Vivo phone keeps restarting and getting stuck at the startup logo. Here are a few troubleshooting steps you can try to address this problem:
1. Boot into Safe Mode: Try booting your phone into Safe Mode to see if a third-party app is causing the issue. To do this, press and hold the power button until the power off screen appears. Then press and hold the "Power off" option until you see the prompt to boot into Safe Mode. If your phone works fine in Safe Mode, then the problem might be caused by a third-party app.
2. Wipe Cache Partition: Sometimes, corrupt cache files can cause your phone to get stuck at the startup logo. Try wiping the cache partition by booting into recovery mode. To do this, turn off your phone, then press and hold the Power and Volume Up buttons simultaneously until the recovery mode menu appears. From there, select "Wipe cache partition" using the volume buttons to navigate and the power button to confirm.
3. Factory Reset: If the issue persists, you may need to perform a factory reset. Please note that this will erase all data on your phone, so make sure to back up your important files first. To do a factory reset, go to Settings > System > Reset options > Erase all data (factory reset).
4. Update Software: Make sure that your phone's software is up to date. Check for any available system updates by going to Settings > System > Software update.
If none of the above steps resolve the issue, it's possible that there may be a hardware problem causing the constant restarts. In that case, it would be best to bring your phone to a service center for further diagnosis and repair.