Why won't my Droid mini send texts to about 1/3 of my contacts?

A

AC Question

Droid mini won't send texts to about 1/3 of my contacts.

I seem to get messages, but can't send. I have deleted several contacts and reentered them and it only fixed one. I tried to clear the Cache in the Messaging app in Settings and when I push the "clear cache" button, nothing happens. Additionally, although I get messages, it shows the phone number it came from but not the name of the person. I found if i select the icon next to the message, the contact opens. Then if I select the text icon in their contact window, the name will now replace the phone number. But only temporarily. Many bounce back to the only showing the phone number a few hours later. This and several other issue make me hate this phone.