Doug - 2018-09-29

I seem to be dealing with this same issue on a Dell Inspiron 5570-5521slv with Windows 10 Build 1803 installed on an SSD drive with secure boot disabled.

ref: https://sourceforge.net/p/veracrypt/discussion/general/thread/3e9ec24696/

After removing the DcsInfo file from the VeraCrypt 1.21 install the system stopped rebooting endlessly and presented the expected password prompt.