I mean if they don't have the stock there isn't alot can be done unfortunately. it's a shame you are downgrading to apple 😜. but seriously how long do you have these phones for before sending them back?
man I feel bad for you,it's strange how some people have overheating issues and others including myself have near perfect phones. I would say give them another chance as this phone is awesome. I'll gladly send you one of my old phones while you wait for replacement 😅
it's been a strange but interesting journey with s21 series so far. some people have only had great experiences to share but some like me have had mixed experiences. s21u is a beast in every aspect and I love android for the level of customisation it allows but Samsung seriously need to up their QC game. I have been using 12max and 21u since last few weeks and i can clearly see android (samsung in particular) has come a long way and i absolutely love the versatility the 21u camera combination brings to the table. I'm sure Samsung will address majority/all of these issues in the coming months via software updates
one more thing: galaxy buds pro with 12max sounds amazing, I don't know if it's just me but I definitely feel extra bass with 12 max (though iOS does not have galaxy buds pro app support)
can I ask how you prepared your S21u phones each time ?
Did you synchronise all of your previous information from old phone to your s21 using Samsung switch tools ?
and then after sending the first one back you synchronised the same data to the second one?
I am no expert and undoubtedly there are some handsets out there overheating more than others.
my experiences with overheating effects were fixed by carrying out a factory reset and manual installation of apps.
my original synchronisation of my 400 + apps between android 10 and android 11 caused me with no end of problems, and unknown battery drain. My battery life was rubbish and the phone was heating at random times...
After factory reset and no synchronised apps and data... the experience was completely different.
I am not suggesting for a minute that this is your case... but if you did perform smartswitch then you may find all your problems are resolved by trying this.
I only had a few apps Installed, I started from scratch. And in any case this should not happen, even if you transfer the apps. Because the problem is the camera module which is using to much of processing power and maybe the cooling system which seems to be inefficient.