Seeing black lines on my screen would concern me as well, pohare. Let's see what could be causing this. How long has this been happening? Did this start with any new apps or software being installed on the device?
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The black bars as seen on certain apps is due to a interaction issue with the new version of Android System WebView available in the Play Store.
For now, please use the below workaround and roll back to factory default version of the Android System WebView:
Go to Settings -> Application manager -> Swipe left to list “ALL” tab -> Find the “Android System WebView: tap on it -> choose UNINSTALL UPDATES
On the next dialog box “All updates to this Android system app will be uninstalled” -> select OK
On the next dialog box “Do you want to replace this app with the factory version?” -> select OK
The Android System WebView will be rolled back to version 49.0.2623.105
To ensure that Android System WebView is not auto-updated to the new version on the Play Store, please follow the below steps:
Launch Play Store -> Go to My apps & games -> Find “Android System WebView” in the list of apps -> select this app, and tap on the 3 dots on the top right.
If the Auto-update box is checked, please un-check it.