A couple of annoying issues - any help appreciated

I've tried the search and what comes up seems to be pretty old so I thought I would ask the community to see if I can get some help with a couple of annoying issues I'm having.

1. I've noticed that the WIFI connection at my work seems to have to reconnect when I close the laptop or if the screen goes dark for long time (1 hour). Originally I didn't have this problem and now I seem to be experiencing it for whatever reason. Could this be due to my Energy Saver settings? For the Power Adaptor I have the following settings:

Computer sleep: 15min

Display sleep: 15min

Put hard disks to sleep when possilbe and Wake for network access are both checked.

2. This problem happens like 1/20 times so I don't think I could reproduce it if I took it into the store. When I close my laptop, sometimes the screen doesn't come back - it just remains black. Even if I hit the keys to try to 'wake it up'; it won't do anything or I will have to close the laptop again and reopen to try to trigger the computer awake. Is there a setting for this or is this just a glitch?

Thanks in advance - hope that peeps won't be too brutal if I did miss a post that could have answered my questions.

-Mike