My iPhone case messes up my Wi-Fi?

I have a iPhone 5 and I got this case it's plastic. Looks like this My iPhone case messes up my wifi
Anyways I put it on and all of a sudden my Wi-Fi signal turns weak and I'm confused. When I take it off my signal is strong. Can someone explain what is happening? I like this case a lot but it messes up my Wi-Fi.

My case does this to me as well.

My otterbox is thick rubber and it hurts my wi-fi reception. Maybe try a thinner case or put the Wi-Fi closer

This is a very common problem with the iphone 5. Some people have reported that doing a hard reset will fix the issue. It may be worth a try.

here's how:
http://www.wikihow.com/Hard-Reset-an-iPhone

also visit the source url below to read about the tons of other people that are having the exact same issue.