So I have a Fender Jazz Bass and I was playing it the other day and once I got to the 5th fret there was buzzing, and past the 5th fret (depending on what I was doing) there was severe, sort of, clunking? I was playing “So What” by Miles Davis and the part that I really noticed it was during the first run on sixteenth notes in the beginning. The EQ settings on the amp were all equaled out and there was some overdrive. I was using the bridge pickup with the tone control turned all the way down. The strings were changed sometime in January if that is of valuable information. After researching the problem my initial thought process is maybe it could be an action problem? As far as I can tell it is fairly high. Help!
If the sound is noticeable when you play the instrument with no amplification it is probably time for a truss rod and action adjustment. Changes in temperature and humidity can affect instruments and cause buzzes to start creeping in. Judging from where it’s buzzing your neck probably has a little back bow and you need to have some relief, or a slight concave curve added to the fingerboard by loosening the truss rod. There is a fine series of 4 videos by John Carruthers that explain the process of performing your own setup, here is the first one:
I recommend not trying step 3, adjusting your nut, it is a delicate process and requires special tools and more experience but the other three are doable with some care and a little experience with basic tools.