WhatsApp for Vivo Y27

On the Y27 this is usually caused by a corrupted cache or an outdated app version. First go to Settings > Apps > App Manager > WhatsApp > Storage and tap Clear cache (not Clear data). Then open the Play Store and update WhatsApp to the latest version, and make sure Funtouch OS itself is current via Settings > System update. If it still crashes, reboot the phone and confirm WhatsApp isn't being throttled under Settings > Battery > High background power consumption. See how others solved this on Reddit

Funtouch OS aggressively closes background apps, so allow WhatsApp to run freely. Go to Settings > Battery, find WhatsApp, and turn off the background power consumption / high background power limit for it. Then open Settings > Apps > Auto-start management and toggle WhatsApp on so it can wake to deliver messages. Finally, check Settings > Apps > App Manager > WhatsApp > Notifications and enable all categories. Locking WhatsApp in the Recent apps switcher (open recents and tap the lock icon) also stops the system from clearing it. See how others solved this on Reddit

Funtouch OS does not let you move app installs to an SD card without root, so WhatsApp itself must stay on internal storage. What you can do is open WhatsApp > Settings > Storage and data > Manage storage to delete large media, and turn off media auto-download under Settings > Storage and data. To offload existing photos and videos, use the Files app to move the WhatsApp media folders to the SD card, though newly received media will still save to internal storage. See how others solved this on Reddit

Vivo's global update policy gives budget Y-series phones like the Y27 a limited window of major Funtouch OS upgrades plus periodic security patches, so check Settings > System update regularly. WhatsApp updates independently through the Play Store, so even after OS updates slow down the app will keep working as long as your Android version stays above WhatsApp's minimum supported level. Keep auto-updates enabled in the Play Store so the app never falls behind the required version. See how others solved this on Reddit

The Y27 is a solid budget choice for WhatsApp calls and messaging, but set it up so notifications stay reliable. Turn off background restrictions for WhatsApp under Settings > Battery, enable it under Settings > Apps > Auto-start management, and make text easier to read with a larger system font under Settings > Display & brightness > Font and display size. Enabling WhatsApp's two-step verification PIN (WhatsApp > Settings > Account > Two-step verification) also protects the account on a shared or rarely-updated device. See how others solved this on Reddit