I did some checking on this for you adunn2002 and I haven't seen that we've been getting reports of this happening. I do have some advice for you though. Do you power off your phone at least once a day? Doing this is a good best practice to give the phone a "rest" and make sure it works properly for you when you need it. It also resolves a large portion of mishaps like audio troubles.
You could also check to see if this is happening with every number or just a few numbers. This'll help isolate the source and be useful information to provide a solution for you. You do want to make sure the microphone hole on the device is clear of debris and isn't being blocked by a case or cover as well.
If you are in need of more help, you can Contact Us and get in touch with Tech Support or message our T-Force team through the social media links below. You can have them reference DOC-37247. It'll help them address this further for you if you need more help.