For every great thing tech bloggers have said about Windows 10, there seem to be a whole lot of complaints from users. Much of the fuss is focused on the fact that Windows 10 may be spying on everything you do by default, but we’ve shown you a number of ways to stop it. For more details, check out our post on 6 free tools that stop Windows 10 spying.

But there are also some other problems with Windows 10 that are getting users riled up, and the latest complaint is one that could end up costing you hundreds of dollars.

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A woman traveling around New Zealand came home to find a bill from her wireless service provider totaling nearly $400 for the month of August, but she hadn’t used her service very much while traveling. The culprit, as it turned out, was Windows 10.

Microsoft has released a flurry of updates since pushing Windows 10 out to the public less than a month ago, and the company’s new operating system is configured to download those updates automatically in the background by default. The problem, as it turns out, is that many users aren’t aware of this setting, and the updates continue to download when users are tethered to wireless data.

The Sydney Morning Herald has more on the issue. If you’re worried about blowing through your wireless data cap and costing you a fortune, be sure to check out our earlier post on how to disable automatic updates in Windows 10.