I have an 04 screw with the factory sub. Every once in a while it will just stop working (the sub), then start working again the next day. I figured a flaky fuse. Now it has been a few days without any sub. Should I start looking for the fuse or could it be something else? No bass is very annoying...

 

I dont think you can have a "loose" fuse when it comes the factory blade style fuses. I would me looking more at the plugs in the harness to see if one has come loose.