@osmith977 , Owen, Below I found what looks to be a guide(1st link) to reset your camera to factory settings. See if there is dust/lint/debri between button and dial causing it to stick and try to pick/vacuum it out. Also posted below is a guide that talks about the various settings and a disassembly guide, which will get you inside camera and check for damage cable/wire/button/dial and replace if needed. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
https://industrydev.com/how-to-reset-your-canon-rebel-t3i-to-factory-default-settings/
http://www.imaging-resource.com/PRODS/T3I/T3IMENUS.HTM
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