speedo and rev counter

[red imp]

this morning on the way to work I noticed my dials were not displaying(2010 fz1s) intermittently the whole dash would come to life with the rev counter and display showing as they would on start up but then going off again. The only thing different I have done to the bike lately was wash it last Thursday. does anyone have any idea of what the problem might be or how to get the displays working again?  Thank You.