Display not initializing

Not sure if anyone else has seen this, but more often than not my VS-100 will not show the display on power-up ... the backlight works, but no VS-100 version 1.5 boot messsage and no display...   It sometimes takes several power ups for it to display anything..
 
I have contacted Roland UK as the unit is in warranty (just) but just curious as to if anyone else has seen those symptoms ??