[Elecraft] KPA1500 display on 28mhz

[Bill Stravinsky]

In the recent 10 mtr contest over the weekend, after just a couple transmissions the display goes berserk and then just displays "28 MH with PWR under that".Then when transmitting the PWR will read anywhere from 1 to 4 digits of the power.  It will stay that way until the amp gets switched off then when turning it backon it will do the same thing after a transmission or two.
I thought I saw this reported at one time and wonder if there are any explanations of this behavior?  It works fine its just the display missing its normal readoutof everything to the right of what is showing.

BillK3WJV