I have a trace elliot ah350smx that has some intermitent noise issues. It makes popping noises whenever i hit a string, and sometimes just takes out the volume by at least 3/4 of the way. sometimes while it is like this, i can pluck a few notes and it comes back to normal volume and the popping goes away. I have brought my amp to a repair man, who told me yea the effects loops can get dirty and he simply sprayed one pot and it magically came back on, and did for about a month. Then it started again, I already tried jumping the effects loops, theres two, with no avail. its not the instrument cable either(this time) or any other cable connected to my amp . And i have to constantly be spraying the jacks with contact cleaner, pretty much every time i play.I have noticed when i have the volume on my bass turned down it will not do this poping thing it does. but as soon as i turn it up to any normal volume it pops again, what do i do?