Following complaints from a large number of new MacBook Air owners with WiFi performance issues, according to 9to5Mac, Apple Lossless Audio CODEC (ALAC), is investigating the problem.
In the US, the Genius Bar will pick up the MacBook Air (13 ", mid 2013) and MacBook Air (11", mid 2013) with WiFi issues.
Users report that the failure comes after once WiFi is being used on these computers, the connection shuts down after a minute or two requiring a restart of the computer. Likewise, it has been reported that Apple is offering these customers new equipment in order to be able to have contact with the problem equipment, which will be sent back to Apple in order to thoroughly investigate the origin of the problem.
MacBook Airs from mid-2013 use the new 802.11-ac WiFi standard, which is designed to offer faster connectivity and better bandwidth. As of today, new reports suggest that the problem that users of these new computers are experiencing could stem from a standalone WiFi software issue.
It is not known if the two issues are related, but both can be resolved through a software update once the issue is isolated.
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Source - 9to5Mac