This worked for me a year ago - since I did it the problem never recurred. I think the front of the B2 was very slightly misaligned and this fixed it.(Hope I haven't jinxed it LOL)
"After trying every other suggestion in this group with no success I finally tried this.
I followed the instructions to remove front panel contained in the pdf found here
https://www.brennan.co.uk/imagprod/BrennanB2HardDriveUpgrade.pdfReplaced SD Card and powered up with panel removed (CAREFULLY) and the cd shot out of drive.
Powered down removed sd card replaced panel and reassembled."