My A71 has started having a jumping Jerry screen,but not all the time. Any ideas

[Chez31]

MY a71 has got a jumping jerky screen all of a sudden,but not all the time.

Any ideas would be appreciated.

Thanks.

[BandOfBrothers]

You may need to try a few troubleshooting steps before approaching a Samsung Service Centre @Chez31 

• Ensure your phone's software is updated. 
• Ensure all your apps in the Playstore and Galaxy Store are updated. 
• Remove any apps acquired via apk files if applicable. 
• Remove any themes you may have downloaded. 
• Safe Mode  > https://www.samsung.com/uk/support/mobile-devices/how-to-start-my-galaxy-device-in-safe-mode/ turns off downloaded apps and themes etc which may highlight an app or theme that's causing conflict. 
• Clear Cache Files from the phone's System Partition Section  > https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/ You may need to insert your earphones or hook upto a powered On Laptop or use a Tv's USB Port to access the Clear Partition Section. This may help with lag or stutters as this clears the phone of old/unused or broken cache files.There is also a Repair Apps option in the Menu System too. 
• A last resort would be to back up and factory reset.

Let us know how you get on please.