Why are messages disappearing from my gmail account?

I saw the message I was looking for in my gmail account one minute, then it disappeared the next. or:I saw the message I was looking for in my gmail a

I saw the message I was looking for in my gmail account one minute, then it disappeared the next.

or:I saw the message I was looking for in my gmail account one minute, then it disappeared the next.

or:Look into the spam section, or the achive section.

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