over some time now I have been having stability issues with my spark wifi.
The wifi symbol blinks/changes rapidly between the to pictures bellow.
The wifi connection point is in the same room so i do not believe that poor connection is the issue unless it goes to another.
The LED pulsates/blinks in green
Is your router configured to use a single channel, or using some automatic mode? Wifi connection can drop for a few seconds when a router hops between channels.