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Sorry that Lightroom Classic CC is freezing while the SD card is manually ejected or ejected by Lightroom/system.
This issue has been identified as a bug and our Engineers are working towards a fix. Please add your vote to this discussion by clicking the "Me-Too" button up at the top right: Lightroom Classic 7.3: Unresponsive after Eject SD Card/USB Drive | Photoshop Family Customer Community
Marked with me too. Thanks.
Sent from my iPhone
A "reasonable" solution, in the meantime, is to copy the images to your hard drive using your system browser first. Then import them into Lightroom using the Add option.
This issue has been fixed in Lightroom Classic CC 7.4 (June 2018 release)
Please update Lightroom to the latest version. See Keeping Lightroom Up-to-Date
Here's what new in this release: New features summary for the October 2017 and later releases of Lightroom Classic CC
Feel free to share your feedback.