G530H/ds dual sim no service on Sim 2

I have many g530h/ds which has this problem
Some days its work ok but after some days without any version upgrade without any other work on phones
Automatic Sim 2 was not working
Sim 1 work ok but sim 2 emergency calls only
Both Imei of the phones was ok and clean
What is this problem
I tried to upgrade to lollipop but same emergency call on sim2 but on lollipop on mobile network settings sim 2 was detect,sim name was detected and sim phone number was also detect by phone but emergency calls only on sim 2
Please help

Shahzaib Jahangir