Hi Jeff welcome to NT.

Stress in general could be causing it, if we are distracted we become less mindful of day to day stuff. Plus texting is different from speaking, so if we are in a hurry word choice errors are pretty easy to make. I think what you are describing is fairly common, whether the person is a TBI survivor or not.

The real question would seem to be if word finding difficulty is interfering with your day to day functioning. If “no”, either don’t worry about it, or try some things to alleviate the stress you talked about. I’ve found meditation and yoga to be helpful stress relievers.

If this problem is impacting you day to day functioning, you may wish to consider seeing a speech therapist, they can deal with many aspects of communication deficits, not just verbal speech.