could be...BUT, probably not. More like a sign your wiring or connections are going bad. Possibly even the speakers power unit. Try fiddling with the wiring and see if it makes buzzing or funny noises when you do that, if it does, either rewire it with new wiring or buy new speakers-)
Check ALL your connections first.
The itsy bitsy spider climbed up the empires state building, along came goblin, wiped the spider out