L2TP VPN - Router Connection

[cyberjox]

PC clients via L2TP VPN works without any problem, but router clients via L2TP VPN works for few minutes then stops even it is still connected (connection does not drop). Do I need to enable IPSec for it to work continuously? Or other configuration is required for pfsense or on the client router?

Appreciate any help.

Thanks!

Update: Connection is continuous and can ping websites continuously as well, but all will stop when website is accessed via browser. L2TP VPN does not drop or lose the connection.