my 8yr old grandson is in vyvanse, he is ADHD, he only takes this medication for school days, half a capsule in water in the mornings before school. why is he now experiencing trouble focusing at school? he is followed by a specialist but this issue has just risen and reported to me via his teacher. Also, what is the expiry for Vyvanse? He is on 10mg daily at present. I had it refridgerated for the summer..............is this okay................... I just read that it should be at room temp., will this now change the way it performs? Thx