Wireless connections stops working time to time...

These are the wireless settings on the router:

                                             <label class="duple">Wireless Radio :</label>                                                 Enabled                                             
                                                                                                                                               <label class="duple">802.11 Mode :</label>                                                                                                                                                                Mixed 802.11n, 802.11g and 802.11b                                                                                                                                                         
                                                                                                  <label class="duple">Channel Width :</label>                                                     40MHz                                                 
                                                                                                  <label class="duple">Channel :</label>                                                     5                                                 
                                                                                                  <label class="duple">Secondary Channel :</label>                                                     1                                                 
                                                                                                                                                   <label class="duple">WISH :</label>                                                                                                                                                                   Active                                                                                                                                                           
                                                                                                                                                                                                    <label class="duple">Wi-Fi Protected Setup :</label>                                                     Enabled/Configured

I have a laptop which does not have N capability so I can't stick with just N on the router that is why it's mixed.

The channel, do I change that on the router or my USB adapter?