I have purchased a 1TB hard disk with my laptop. When I am playing any video file from that HDD, within a few minutes the hard disk is automatically demounting.
Is there any loose connection? (cables not connected properly to the HDD)
What is the solution for this?
This shouldn't happen in general.
Does this happen with all the video files? Always?
Did you recently made any changes in the disk partition or format?
If yes, then I suggest you backup your data and try formatting the 1TB HDD with ext4 filesystem.
If not, as you suspect, it could be a loose connection or HDD issue, I suggest you contact RDP directly for the resolution.