MBA Keeps dropping Wifi

so mba keeps dropping wifi reason. happens on home network, , computer. i'm mac on network. every other wifi network fine, every other computer on network fine. many things can happen. it's connected, not able access internet (whether tells me there's no internet access or not). may drop wifi altogether, , refuse connect (see pic).

generally, if unplug router , plug in, it's good. works if restart computer. happens multiple times day. yesterday did know connect (restart router many times, restart mba), , nothing worked. magically worked.

how can stop happening? got notice comcast while ago saying bot called dns changer detected on 1 or more machines on network. i'm assuming can't me, right?

 

what linksys router have. when first got imac had issue wifi disconnect , reconnect minute later. happen every 10 minutes or so. came across thread said should update router firmware , see if helps. fixed issue right after did that. router linksys wrt54g.

 

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