If you are a teacher in Texas and you are worried about your contract being non-renewed, there are some things you can do to help yourself, and possibly head off the non-renewal.
If you have a non-probationary term contract, the district has to show cause why your contract should be non-renewed, and the district has to have evidence to back up that reason. Further, the district has to show that their reason exists at the time of the proposed nonrenewal, not merely at some time in the past. So, for example, if you had a record of being tardy 3 days out of 5 last year, but had been on time every single day this year, the district could probably not use tardiness as a reason to non-renew you contract.
So, if you think your contract is in trouble, here's what you need to do:
Respond to everything you get in writing, explaining how you will correct the situation (or why there was a misunderstanding and you were doing the right thing all along) and then follow through. Write a followup note saying that the correction has been made.
Make sure the principal knows all the good things you've done and that parents have praised you. Put these things in writing. If you have an oral conversation with the principal, do a followup note summarizing the conversation.
If you have a growth plan, get it completed and send the principal a report on everything you do. If there is something in the PGP you can't get completed, send a note recording the steps you took to try and do it, and what kept you from getting it done (no seminars on the topic scheduled, team leader was invited to your class to observe but never made it, etc).
The point here is to create a record of how you have attempted to meet all the expectations placed on you. If you do this, one of two things might happen. The first and best thing is that the principal might get information he/she would otherwise have missed that will cause the threat of non-renewal to evaporate.
The second is that if you get a proposed non-renewal, you may have the evidence to show the reason for the proposal is either non-existent or no longer exists because you corrected the concern.
If you need help, contact your teacher association or me.