I have the same issue. We were even away on a holiday and the tv was not used for 1month. Before we left, it was working fine and when we got back when i tried to play a saved movie in my hard drive it won't display the files. Tried another usb and it's the same. Both my hard drive and usb are working on my other tv and laptop. Its not the port as it will recognize the usb but wont display/read the file. I also have the updated version already. I have raised this to the tech support but no help. They sent techinician and was advised that need to replaced the board and i need to pay php7500 to have it fixed and repaired because my tv is out of warranty. Sadly it went out of warranty on dec 23 2019. I am very disappointed i chose samsung for durability and yet this happend. I have now escalated it to the service center here in Cebu Philippines and the branch manager will forward this to the head office hoping for their response soon. Reading all the post it seems to be a known spftware issue most of us experience january and december..
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