When using your TC20 with an RFD 2000 sled, you could possibly encounter an issue where your TC20 would appear to freeze and or crash when starting TracerPlus.
The cause of this issue is that your RFID Manager application could be the incorrect version. What you will want to do is check the current version of the RFID manager application on your TC20. Then go to https://www.zebra.com/us/en/support-downloads/software/utilities/RFID-Manager-Application-for-RFD2000.html.
If your version is not the same version as is listed on Zebra's website, download the new version and your TC20 should function normally.