Moisture can be a contributing factor as gfci 's are very sensitive to resistance and moisture will enhance that.
I would first check your starting and running watts or amps of your vacuum cleaner. I guess it will be upwards of 12 amps if correct.
That puts a resistance or stress level on the gfci that will trip it. Your hair dryer probably does the same if run for a bit.
I would try a new gfci on that circuit or find a lower amp vacuum.
Some get upset when they trip but forget the logic behind the gfci's, grounding out when detecting a high amount of resistance, before the circuit can become complete, hence avoiding a pretty good jolt.
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