Auto correct changes correct to incorrect on my iPhone 15 Pro Max

Multiple times is has changed my correct text messages AFTER I pressed send. It changes names and words which are correct. Siri used to be an asset. For the past two years, it’s been a detriment. Between changing my texts to incorrect words and a faulty Siri, after 2 plus years, I’m considering buying a different phone. Pity because I have 9 Apple devices but consider this unacceptable technology after years of problems.

[Re-Titled by Moderator]

Original Title: Auto correct changes correct to incorrect