S21 5g

[PrincessDonna]

I can't wait for this contract to fìnish next year, so I can get rid of this sorry excuse for a phone. It's a complete waste of time. I can rarely do anything and complete it, without it crashing before ive finished. I've been using samsing phones since Note 1. I'm not sure im gonna get another samsung, after this one. 

[Glenntech]

Might be worth exploring things like wiping the Partition Cashe on the phone
If the phones memory is nearly full, this will cause the phone to refresh and crash sometimes. So consider backing up in cloud and deleting off the phone.
If you are using a third party launcher or theme. If the developer hasn't updated the software for a while. You can have issues
Naturally make sure the software on the phone and it's apps are updated
Your phone should run smoothly
If you used Smartswitch to setup your phone wirelessly. Consider backing up your phone and resetting it. If you don't have the old phone still. Set it up using the backed up data.
Photos and videos, I backup in more than one cloud storage.
If you are within a returns period, and you just aren't happy with it. You can consider this route.

[JAMES4578]

@PrincessDonna  Just to add  to @Glenntech 's excellent advice it is advisable to wipe the cache partition after updates and can help with crashes/lags. Temporary files are deleted but your Data is kept intact.  If unsure (and for he benefit of others)  follow these steps:

1. Turn off the device.
2. Connect To Computer or plug in USB-C Headphones , Press and hold the Volume Up key and then press and hold the Power key
3. When the Android logo displays, release all three keys.
4. An 'Installing system update' message will show for 30 - 60 seconds before the Android system recovery menu options appear.
5. Press the Volume down key several times to highlight wipe cache partition.
6. Press Power key to select.
7. Press the Volume down key to highlight yes, them and press the Power key to select.
8. When the wipe cache partition is complete, Reboot system now is highlighted.
9. Press the Power key to restart the device.

 You can also Repair apps from the same Recovery Menu which would be advantageous.

[nowdeleted]

I have a s21 5g. To be honest I have had no problems with it.
It's looked after with everything updated and a cache clean at least once a month.

[vialli100]

Not any problems with mine either..

[cavellix]

I've never had any problems with mine either

[LuLu37]

I have the same phone and have had massive issues since the Android 13 update.  Phone reboots suddenly or turns itself off.   Samsung technician has confirmed a software issue.  The last 2 security updates have not sorted the issues out, although the rebooting/turning off has lessened.  Samsung customer service is non existent.  No amount of clearing caches works, and I’ve had factory resets done as well.  I’ve had Samsung phones for years now, but these last few months, combined with the poor customer service from Samsung means they’ve lost my custom once my contract is up…..or before if I have to upgrade early due to the phone not being fit for purpose!