@harshalp2212386 -
Can you please confirm what build you are on?
Did you have any recent upgrades on this instance, and if there any errors in the post-upgrade logs?
Have you added any extension activity to Javascript, and is it custom?
For the second part, in cases where the Recurring Delivery activity doesn't add it to the outbound schema by default, only then you need to enable the check-box "Do not retrieve the target population".