Work around for AT&T DL72310 randomly blocking calls (no rings), Phone directory list was downloaded using Bluetooth method

I purchased 2 AT&T DL73210 from the AT&T online store, one in Feb. 2022 and the other in Oct. 2022.  I discovered both phones exhibit the same problem.  The phones randomly pick phone numbers in my downloaded directory (Bluetooth method) and block them.  The phone does not ring and the call history may display a goofy number. For example: 506-d72-7973, 506-26d-766d, 456-*6*-6573 where "*" was an upside down "A".  

Additional information:

I also had a AT&T EL52300 and a old dial phone connected to the landline during the blocked calls by the DL73210.  I observed these 2 phones (EL52300 and old dial phone) would ring twice and then nothing.  The caller would also hear 2 rings and then nothing.  The call history phone number was displayed correctly on my EL52300.

I called AT&T support and the person was helpful addressing the problem.  Initially AT&T requested that I contact my landline provider due to the wrong phone number recorded in the call history.  Once I explained my EL52300 phone recorded the phone number correctly in the call history list, I was then asked if I used Bluetooth to download the directory from my smart cell phone, I said yes.  We then cleared the directory list in the DL73210 (from menu option) and then removed power from base station plus removed batteries from all 3 handsets.  Next: put the batteries into handset, power up base station, set time and date, manually put blocked phone number in directory, had the person call me and it worked.  I then used the Bluetooth method and downloaded the directory again.  The blocked phone number that was manually entered now works but 2 other blocked phone numbers in my directory still do not work and I also discovered my cell phone number is now blocked.

Additional observation:  The random blocked phone numbers are displayed correctly in DL72310 directory list. You can call the random blocked phone numbers from directory and the calls correctly go through. The problem is when caller that is being blocked calls you, the number displayed in the caller ID or call history does not match the phone number stored in your phone directory. You may see goofy phone numbers with characters in the call history and caller ID.

Possible solution:

I have manually entered all phone numbers into the directory which was a painful 2-hour process.  Manual entered numbers so far appears to be working.  I am not happy with the Bluetooth download directory method using your cell phone which was my main reason for purchasing the phone.