@Mazin4: When you connect your SSD drive and attempt to record a programme, do you get a prompt to format the drive? If not, I recommend formatting your SSD via your home computer, then trying again to see if this helps. If the above isn't applicable, make sure that there is at least 1.5GB of storage space available on the external drive, as this is required to successfully use the Timeshift function.
@Mazin4: It states in the user manual that the feature may not be available due to your geographical area, although if it's worked in the past on a different model in the same region then this shouldn't be an issue. When you're on a channel/programme that you want to record, can you try pressing the button with a red, green, yellow and blue dots on, with '123' below the dots, twice. Does this bring up a menu of options, including Recording and Timeshift?
