Hello, @sliu1!
For what I read, your flow is still running (meaning you haven't got any email saying that your flow was going to be disable if left unused), right?
I have some theories as to why is not working properly. Something that has personally happened to me, is that I add data to an specific source (e.g. Sharepoint) and because I have it opened when the flow is running, it doesn't work properly and duplicates emails or it doesn't detect some new data.
I would also recommend you double checking the connection to make sure everything is running correctly, although if you are getting some of the emails, that should mean everything is well connected. I'm not sure if someone has another idea of why this could be happening, but let me know if that piece of advice helped you!
Cheers,
Rodrigo