eM Client noting working with comcast/xfinity

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. Restarting the computer helps 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? Can someone help?