Why My Gps through draw map is freezing my Application

Why My Gps through draw map is freezing my Application

I am creating Walk through draw path on google map v2 in android just like
runtastic App.
Requirement:
-> Draw Path ever 1 second.
-> update Distance between start and current location.
-> Update time
-> Many more..
Application is working on background also but if application is run more
then 30 minute then application and phone is freez/hang.
I think problem is drawing map and calculating some stuff.
please give me some solution or stuff so i can improve this thing in my
application.
I am work with last 2-3 days but not find out any proper solution.