Unhappy [Q] vodafone 845 help

hi guys i need some help with this phone i have it about a month now last week it started playing up screen light will not time out have set settings to 30 seconds but no joy all icons on screen start flashing on off so i put The Celestial Teapot RLS4d on it today to see if that fixed the problem looked good for a while but back to the same problem how can i fix this or can it b fixed im new to all of this so please be patient with me because im Losing mine please help thank you