So why do stocks seemingly seem to get pumped as soon as the market opens and then crash throughout the day back to where they were?

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I've been trading these last two weeks and I've noticed this pattern where stocks seem to have a meteoric 5 percent rise at the beginning of the day(like first 10 mins after market opens) and then crash back down afterwards in like no time. I've been mainly only trading amd and micron. But I've noticed it with other stocks too.