Fuzzy playback

I have noticed that my system sounds fuzzy or scratchy.  I am pretty sure the ethernet connections are the fault.

I have used DeOxIt2 for years.  It has been a good fix for this problem.  For some reason, I did not do that when I added filters.  

I have seen some folks are using other contact enhancers. I don't want to spend $500 a bottle.  Any suggestions would be appreciated.  Thank you.