iPhone 13 Pro Max
My keyboard has gotten a bug that it basically types gibberish as I’m trying to write texts.
iPhone 13 Pro Max
Question marked as
First check for security apps and get rid.
Then try a Forced restart Force restart iPhone – Apple Support (UK)
If no better you should arrange a repair
iPhone Service & Repair - Apple Support
Or
Contact - Official Apple Support
Anything other than Screen or Battery may be a replacement phone and the price is in the article under "Other damage"
See also: Get your iPhone, iPad, or iPod touch ready for service - Apple Support