Футбол!

Это клуб для футбола без мяча

When I try to start simul with number of people It is difficult to collect them all: some people are dissapearing from the list after I accept them. For example player from iphone while waiting I accept all people doesnt touch anything, his phone's display switchs off and he is dissapearing from the list! why?? I thing it is problem of last month, i cant remember things like this in summer.
It is not right.
And
May be make possibility to enter simuls after the beginning?