My phone has randomly started declining my contacts, I've reset the phone, cleared the cache and restarted the it and this hasn't helped the problem. The exact 5 contacts are still being blocked and they're not on my blocked list. Any idea as to why this started happening all of a sudden, how I can fix it?
1. Is this happening on the Stock Phone app. Have you tried using the Google phone app just to check if it's an app related issue?
2. What carrier are you on?
3., What software version is your S20 on?
Check and install software updates for your phone.
Try submitting an error report through the Samsung Members app