"Connection Failed" Error on Guest Network

Using Airport Utility, I created a Guest Network so I could create a separate WiFi network for myself. I connect to the network but then after exactly using it for one hour it disconnects me. I try and rejoin the network and then it says "Connection Failed" and the password is definitely correct. The only solution I have found is to remove the guest network then create it again. This only gives me another hour before I have to repeat the same process again. If I don't do this, then I have to wait until the next day before using the guest network for just one hour again. I have checked if there are any Time Restrictions but there are none. I'm using a MacbookAir (Retina Display from mid 2014) and it is running on OS X El Capitan Version 10.11.4. If anyone could help me with this issue, I would appreciate it.

Thanks