Light flash after around 20 minutes after i open it???

Not *quite* sure what you're getting at here.... Are you saying the thing will jump between low and high beams on its own, or are you saying the Hazard lights are coming on? Did this start after you changed the battery? If the lights are *flickering* but NOT switching from Low to High Beams (if this were the case, your blue high-beam icon on the dash would be going on and off as well), then I would say check your battery connections because you've likely got a corroded, poor, or loose connection.

Yes they are Flickering when i open the running light at night. no blue high beau lingt open . yes i just change the battery for a new one. But they was doing the same thing with the old battery. i clean everything around the new battery to make sure there is no corrosion. iwhere do you think i should double chek if the connection is well connected? sometime i was thinking to change the light switch???