it could be some faulty caused by nintendo. that's why nintendo have warranty. it could be the remaining 2% of NDSL that's faulty. god knows.

my point being, it might not be the flashed thingy. coz he played for 3 weeks. did you drop it?

i know you are anxious about the waiting and the price you are going to pay when it's fixed and stuffs like that... i feel sorry for you... try chasing them... call them to ask or something like that