Why sometimes my iMac has a problem at the start? With impossibility to access the wi-fi

I bought this iMac in the Apple Store in Bologna the 10th, and three days later it started to have this problem. Sometimes when I launch it, it appears a loading bar, and after a selection of the user (i do have only one user!), then, it doesn't recognise any Wi-Fi network, and I am obliged to restart the iMac. At the restart, it all goes perfectly. HELP

I bought this iMac in the Apple Store in Bologna the 10th, and three days later it started to have this problem. Sometimes when I launch it, it appears a loading bar, and after a selection of the user (i do have only one user!), then, it doesn't recognise any Wi-Fi network, and I am obliged to restart the iMac. At the restart, it all goes perfectly. HELP

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