[Elecraft] CW memory problem

[Carl Yaffey]

I used the K3 utility to set all 4 CW memories. M1 has my call. I’ve been using that one extensively lately. Today, after an hour of calling W1AW/KH6, suddenly pressing M1 gives me this:
Main display: uC 04.67
VFO B display: FW REV5

The other 3 memories still work fine. I went into the utility and found my call still in M1. I re entered it and saved.
Problem is still there. I need a clue, please.
73,
Carl Yaffey  K8NU
Banjo, guitar, bass, mandolin, dobro. 
recording studio.
cyaffeyNO_SPAM at gmail.com 
614 268 6353, Columbus OH
http://www.carl-yaffey.com
http://www.grassahol.com