3rd party email client issues

I use eM Client on a family computer for 5 comcast accounts. Those 5 accounts are for each family member that receives email on their iPhones using the iPhone email app or outlook. Worked seamlessly for years. In the past month, it stops syncing every day so new emails won’t come in on my eM Client program. I can't get the emails if I log in to xfinity - but even that is an issue because xfinity keeps timing out and won't log me in. Restarting the computer fixes the issue but then it happens again and again. My email accounts are POP3 accounts because I don’t want them to sync with family phones and I leave a copy of emails on the comcast server. I’ve updated eM Client and checked 3rd party access on the xfinity app. How can I fix this?