"I have disabled SSID broadcasting for security reasons."
You need to do some reading about network security, then, because SSID broadcast is not a security issue in the slightest and is important for browsing for the network. As myths go, it's up there with physical address filtering.
It's often wise, in my experience, to ignore Microsoft Update whenever it presents a driver update for notebook hardware. The place to go for such drivers is the notebook manufacturer's support website, where you find the versions that are (often) tailored for your notebook. They may not necessarily be the most recent, but that is irrelevant if you happen to lose out on a particular customised feature or behaviour, or lose some reliability in some way. I am suggesting that this is the cause of your change, but it might be.
Sys Restore is unlikely to make any difference, any more than the famously ineffectual option to repair the network connection.