Whilst the thread is a few months old will put some information here. For memory issues try a Factory Reset, Support-Self Diagnosis-Reset. However some customers have reported that a flash reset was more successful. Instructions for this procedure are
1. press the button at the logo for 5-10 seconds
2. Release the button
3. press the power button on the TV Remote for 5-10 seconds. Tv will go black for a little while and then restart. The Samsung account details will need to be set up again.
Whilst some customers have been advised to use a USB drive if issues persist in some cases following investigation the main Tv Board has been replaced.
Seems to mainly effect 2018 models. There is a very long thread here https://eu.community.samsung.com/t5/tv/apps-storage-space-issue/td-p/808085
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
