Hi Zippyjohn, welcome to the HP Forums. If your wireless keeps dropping, while other product stay connected fine you may have an issue with your wireless card in your notebook. First review these steps, for common causes for dropping. While reviewing this document, it is easy to be in the 'Well everything else works fine' mindset. Try to look past that, and focus on the recommendations: Is Your Wireless Connection Dropping?. This site is outside of HP, so don't bother with any downloads, as I haven't reviewed any of them (if they exist). Just use the information they provide.
I am having problems finding reference to a "envy 1400 sleekbook". What is the product number of your Sleekbook?
Guide to finding your product number
Let me know how it turns out.