Portuguese (Brazil) · Pronunciation Guide
ahs VEH-zees. Two s-spellings in the second word, and the one between vowels buzzes as a z.
"Vezes" ends in -es and is therefore stressed on the second-to-last syllable, exactly as the default predicts, with no accent. The "às" leans on it without stress of its own. The grave accent on that first word is a grammatical mark: it shows that the preposition a has fused with the plural article as.
Listen: às vezes
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Às vezes eu vou de ônibus.
Sometimes I go by bus.
Listen: Às vezes eu vou de ônibus.
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"Às vezes eu vou de ônibus" links "vezes eu" so the final s of the phrase voices into a z before the vowel — "VEH-zee-zew." That gives you three z-sounds in quick succession, and "de ônibus" then adds a palatalized "djee" running into another vowel-initial word.
Devoicing the middle z into an s gives "VEH-sees," which is what the eye suggests and not what the ear hears. Intervocalic s and the letter z both buzz. Learners also write "as vezes" without the grave, which is a genuine spelling error, and they sometimes reach for "algumas vezes," which is correct but sounds more deliberate than the everyday phrase.