Phone number being auto-blocked by phone

[floflo]

For the past week, my mother's phone number is being auto blocked by my phone (Samsung Galaxy S21 Plus). It's a new phone. I have had it for a couple of weeks but this problem has only started happening the past few days. Her number is not in the blocked callers list and I have cleared the cache on both the phone and contacts app and restarted the phone, but she is still being blocked.

[xray]

What do you mean by blocked? What does your mother hear on her end when she calls?

Does your phone show a missed call or nothing at all?

[floflo]

On my mother's end, it automatically gets sent to voice mail. On my end, when she does call, my phone doesn't ring but I do get the voice mail notification. In my contacts, under her number, in the history, it says "Blocked call, Declined by phone". I do not get a notification that I missed the call, I only see it when I specifically go into the phone app and the contacts app.

[T-Speed]

Hi there! 

Is your mother's number the only one that gets blocked?

Have you tried to remove the number from the contacts list and re-add it? 

[floflo]

No it isn't. My home landline also gets auto-blocked.

[floflo]

I didn't realize others were being blocked until I was just asked and checked. Haven't been getting many phone calls the past week as my brothers have been out of town.

[floflo]

Did a bit more research and discovered my phone has an option called "Call Barring" but when I press on it to view the options, it searches for a bit then gives me the following error: "Failed to read data. Something went wrong. Check your SIM card or network connection, then try again."

[xray]

You mentioned the problem is recent. There was an OS update from Samsung that started rolling out Sept 6. It's possible there is a bug in the update. 

[xray]

@T-Speed has the fix. There is a glitch in your contacts on your phone. Remove her contact entirely and create it again.

[Edit] Disregard the above. I didn't scroll down to see your other messages.