Been having issues with my youtube app as well as whatsapp. Can anyone advise?
Could be due to an inconsistent app/system cache. There are many things you can try to fix this :
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Disable and re-enable Youtube app. Settings > Apps & notifications > Youtube > Disable. Allow it to reset to factory version. Re-enable the app in few minutes.
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If #1 does not work, then you can try How to wipe cache partition.
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The last resort can be How to factory reset (Erase all user data) .