The Apple Slate had trouble maintaining that Wi-Fi connections but it promised by the Cupertino that this would be resolved and indeed it was. The recently launched Apple iPad 2 is experiencing Wi-fi issues. This has occurred to many Apple Tablets but some were lucky to have their Tablets remain neutral.
Apple commented saying that it is the Wi-Fi signal but later said that they will address this issue. To solve this temporarily, you need to switch your modem to pure N mode and then it should work but regular devices and iPod Touch won’t be able to access it.