You or someone must have accessed your phone and turned it on inadvertently. If your phone is hacked you will notice sluggish behaviour. Your mobile data will deplete quickly. Battery will drain faster. Apps hang. Phone restart randomly.
As per your concern, we want to inform you that it can happed due to glitch and Samsung provides Knox security system on Samsung devices which ensures that confidential & sensitive data stays safe at every layer of Samsung Galaxy devices. Knox secures Android mobile devices through hard-wired protections while also serving specific management & data security needs. So, The risk of hacking without sharing user information is very low, as Samsung employs strong security measures. However, kindly perform the following steps to resolve your application issue.
Clear app cache through Device care: Settings > Device care > Storage > CLEAN NOW.
The clear cache memory of a particular application: Settings > Apps > Now pick the app you like to clear off the cache memory > Storage > Clear Cache.
Reset the device Settings: Settings > General Management > Reset settings>Reset all settings to their default.
Keep your app updated: Tap on Google Play Store app or Galaxy Store> Manage apps & device> Apps available to update> If you want to update apps individually, tap See details and then tap the Update button next to the app you would like to update.
In case the issue still occurs, please visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/
