My XR6T was doing this... The dim down button was stuck on and when you cranked the brightness up it'd wind it straight back down... I managed to wriggle it enough to get the button to turn off but it's still very sticky and I haven't had time to pull it out and see why...
Cheers,
Tim
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Performance: Complete AUII VCT Wiring & Power Train, Pacey Headers, 2.5" Exhaust, Exedy Clutch, DBA Rotors
Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
Tunes: 8" Pioneer Sub, JBL Speakers, Clarion Double DIN Headunit