VPN frequently disconnects while on BSNL 3G

Messages
1
Location
NA
ISP
BSNL
I'm using Huawei E1750 model and a BSNL 3G prepaid SIM. The internet seems to work fine but I'm not able to do office work from home because the VPN connection keeps disconnecting itself every 5 minutes. Why does it happen? Please help before I shoot myself.
 

Top