First solution/tip : Check for update regullary
Open Apple Store on your device, and see if there is a new app version available. If there is any fix or update, you should download it,it is free to download.
Second solution/tip: You should clear the app cache often
When using any app for long time, including Viber, Skype and other apps, you should clear the app cache from time to time. There are several applications created for this action. Open the Apple Store, download and install the app you picked, and clear the cache. If you are using Andorid go to Google Play and open viber, uninstall it , a nd then install it again. There are lot of free apps for cleaning you can download free. They also can solve other problems with some other programs and apps. Maybe this will solve the problem.
Third solution: Reinstall Viber, delete it, and install again.
Reinstall was the key in many cases. After you have tried some other option, on the end you should try to reinstall. Tap on the app icon on the Home screen, and when you see the little red cross, tap on it. The app will be deleted. Go to the Apple Store, download and install Viber again. It is free to downlaod and istall it again. This solves so mush problems with Viber, and it is problem solver for most apps on iPhne and Windows and Android too.
Fourth solution: Restart your phone
If the previous solutions were not helpful reboot your device. Press and hold On/Off button, and turn the device off. Repeat the action after a couple of seconds, and turn it back on. You can use this method every time phone become unstable, especially Android phone. This also solves problem on Windows 8.1 and Windows 10. You should restart your phone(Androdi, iPhone, Windows) at least one time in week so it can be in good state and without crashing.
Fifth solution: Update your operating system (iOS, Androdi or Windows 10)
If your device is not upgraded to the newest iOS version, or Androd or Windows, maybe that is causing the problem. As always, before you start with updating, make sure to back up all your files. The simplest way to perform the task is wirelessly. Connect your iPhone to a power source, and go to Settings, click on General, then on Software Update. Choose Download and Install.
