Dear Giuseppe,
about the repeated subscriptions , no i's not normal behavior of my application , and there is no increase in the flow data from the adapter around that time , and i there is some kind of attack or many connections i don't think tat can increase the memory that big !!
i changed garbage collections but no use,
u can see the last logs in this link:
https://www.mediafire.com/?tbrfkb4nsj51ax9

Regards,