wifi turns off when screen locked

i have a blu dash m, all good but noticed it turns wifi off when screen is locked, i have already checked settings, wifi, advace, keep wifi on always but it still does

already checked battery optimization to off

already made sure that built-in battery saver is off

i have no third party battery savers installed

phone reset to factory settings

all that was done and still wifi goes off when i lock the screen

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