My S24+ is stuck on the lock screen

[sanam_]

I can not restart or do anything except turn my device on and off. It does not respond to touch, only the first touch. It shows the message:

'System UI isn't optimised for the latest version of Android. Screen touches may be delayed or not recognised.'

I don't know what to do.

[LongHiker]

@sanam_ I would try wiping the device cache. 

To wipe the device cache:

1. Power off your device.
2. Power up while holding down the Volume up key and the Side key until the Samsung logo appears. 
3. An Android recovery menu will appear.
4. Use the Volume down key to scroll down to Wipe cache partition.
5. Click the side key to select it.
6. Use the Volume down key to scroll down to Yes. 
7. Click the side key to select it. The Cache will be wiped almost instantaneously. 
8. Click the side key to select "Reboot system now" 

If that doesn't resolve it, you will probably need to try a factory reset. You can do it via the same recovery menu mentioned in the above process. 

[Tommyj67]

I did something similar on my tablet, I could only get certain screens but was locked out of 90%. After chatting with customer service they told me to do something similar which didn't work so they wanted me to send it in but I said no and that I would wait for my scheduled restart. Later I thought what if I ask Bixby to reboot my tablet and it did, I was sooo dam happy and thought dam I know more than the tech, lol. Anyway, try that, I hope it works.