I seem to be having a shifting issue

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Hi,, I seem to be having an issue with my car not shifting into gear. it would only stay on the first gear but when i pull over shut it off and start it again, it will work great with no issue at all for the rest of the day.. this is the second time i have noticed this problem with no engine light on. I also checked to see if i made a mistake and shifted it to manual but no. It does not seem to be happening always so from what i can tell it that it happened in the morning saturday and monday. Sunday i had no issues