Call History Not Working

I've been calling from my cell phone, hanging up on the first ring on some calls and letting it go to my answering machine on others.  No calls are displayed for Missed Calls or All Calls.  Voice Mail gives a message that there aren't any.  I just tested it again.  Also, since about Dec 15 have not received any robocalls that rang my phone & displayed the Caller ID on the TV, and/or went to my answering machine.  Very odd because I normally receive robocalls on most days that do not have the Spam? prefix in front of the Caller ID.  At one point I thought that only numbers in my Cox Addresses were getting through to ring my phone, but then remembered that I add every new number the first time it calls, and a few of them call more than once, and this was happening in the days before the Call History stopped working.  Thanks for staying after this for us.