Yuzi download

Im in an area that has band 12 hot, and in most times its a stronger signal then band 4. Im using LTE discovery to search the signal. I can reset the radio with discovery and it comes back connected to band 12 but within a min it switches back to band 4. Is there any way to make band 12 the default band or force band 12 only? Im thinking not but wanted to make sure I wasnt missing something.