This problem has now occurred quite a few times on my new Samsung S21 5G, notably just 15 mins ago.
I was only on WhatsApp video call for a total of 10 minutes.
First the phone started to feel a little warmer, so I removed the phone case, then a few minutes later whilst I was browsing the Amazon App (which was the only other app I had open), my multi-window closed because the phone was too hot.
I am out of direct sunlight.
My brightness is less than 20%.
I only had 2 apps open.
And I had no case on.
My phone was not charging and I have the latest software update.
I have also now performed 2 soft resets.
My data, location and Bluetooth were off too.
Can you please advise?
this is what is happening to my device, except i am video calling instead of playing videos. https://youtu.be/Hrq62ni9cWo
have sent for a replacement.