Tablet A8 storage issue disk full with unknown content

[MaartenBXL]

Hello,

My new tablet is filling up the disk and I can't see what is the root cause.  I already checked my documents and other folders via the file manager but I can't find the reason. The issue is the space used by overige

[NJW1979]

I have a refurbished Samsung Galaxy A8 (2018) and as of today, it claims that 23.9 of 24Gb of internal storage space is occupied.  I went into my files and I have less than 3Gb of files on the internal storage on this phone.  I uninstalled a few apps and got 1Gb free, but after rebooting the phone it was back to 23.9Gb of 24Gb full.  The phone is running slow as hell, now, keeps rebooting itself, and sometimes when someone tries to ring me and I have the phone on me it doesn't ring, and I just get a missed call notification, when all my volumes are at 100%.

Is this similar to what's been happening with your Tablet @MaartenBXL?