I closed it out as "unidentified."
There's not enough info from the user. If we had a better sense of where the driver is going and coming from, then constantly gets routed differently, then we could do something about it. US-380 is so far north from Sam Rayburn, I don't know why s/he is being routed there, instead of 380. I"m pretty familiar with the DFW area, so my question is: why is 121 coming into play with the directions?