New order email notification

I have been using woocommerce plugin for very long. Recently I notice that for any new order I received I am unable to get any email notifications. Sometimes I received it sometimes I don’t. I don’t know if anyone has the same issue. I don’t know if it is because the notification was sent to a gmail hence unable to received at times. Does anyone has the same issue? And how to resolve this?

https://wordpress.org/plugins/woocommerce/