Hi I have an Octavia 2011 with a Bolero radio fitted and I have noticed from today that when I switch the ignition on the illuminated front of the radio is dull until after a few seconds it comes on bright any ideas please.

I have seen this once on my Bolero a while back, but it never happened again. Are you on the latest firmware (54)? If not, a visit to your dealer would be worthwhile, as there are major performance benefits to be had, especially with the SD card.