S7 VPN Connectivity issue

HI There,

Does anyone encountered issues with VPN?
I'm using L2TP (PSK) to connect my VPN gateway. The connection succeeds. After few seconds (approx 30 seconds), the phone freezes. Either it reboots itself or the screen goes blank. To get it back working, I have to press POWER+VOL-DOWN button and from the recovery option, I need to choose reboot.

Any help appreciated.

Thanks

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