New Acer Aspire E5-573 wifi issues - wifi working intermittently for a minute or two then drops off

I've just purchased an Acer Aspire E5-573 laptop.  The wifi keeps dropping off intermittently, after a minute or two.  All other devices, including two other laptops (Dell, HP - old) are working fine.  I've checked forums here and elsewhere online, this appears to be a huge problem.  Please advise.