After blink-up, Imp appears in IDE (impCentral), then dissappears

I’ve blinked up a few times. Sometimes the Imp shows up as a Device, but shortly after I start trying to assign it etc. it dissapears from the account. Not even offline, just gone.
MAC 0c2a690026b3
Last used in Legacy IDE a year ago. Have migrated now.
I have another device which works fine, but this one I can’t get to show up.

Are you moving the device from socket to socket? Note that the device the imp001 is plugged into is what the IDE will show, not the imp itself.