How to fix static from SWAN M200 MKII

Recently, I started getting static from my right channel computer speaker(I have a pair if SWAN M200 MKII's). Even when I disconnect them from the computer, I still get static. In both cases, it will be fine for a few minutes then start producing static. I've checked connections. Any ideas? I seem to have misplaced my purchase info....I bought them a year or so ago online, but I don't recall the retailer. Who was handling them? Thanks for any help!