QUOTE(AhBoy~~ @ Nov 20 2021, 01:19 PM)
Warning, do not update the latest firmware.
Many apps become unusable.
QUOTE(dh13 @ Nov 25 2021, 12:49 PM)
Just update: after performed factory reset for my S21 Ultra. I re-set up Whatsapp via Dual Messenger and it is working fine for me now.. Looks like it is the issue after upgrade from One UI 3 to One UI4.
Moving forward, perhaps we should backup WhatsApp inside Dual Messenger data before perform OS Upgrade. Lost a bit of Chat History because Google account in Dual Messenger was not performed correctly after the upgrade. the local backup was not working also
Looks okay after do Factory Reset.. so far so good.. only Shopee app keep crashing.. (coomon issue for Shopee app..

)
QUOTE(AhBoy~~ @ Nov 25 2021, 05:27 PM)
yes, issue occurred for some users as well.
My case I factory reset my phone, also backup and restore using smart switch, then the phone seems working alright...
troublesome, take 1 or 2 hours but better than waiting for samsung to release a fix/next updates
QUOTE(AhBoy~~ @ Nov 25 2021, 05:51 PM)
yes for my case
and if you scroll back a page, or navigate samsung member forum, you will see other users reported same got fixed as well.
Yup.. Same as
AhBoy . Factory reset did resolved issue for me too. I was thinking to wait them to release update to resolve the issue.. but end up I decided to format instead of waiting