#1
I bought my Cornford Roudhouse 30 a month or so ago.
It's been fine, but today when I was going through songs to get ready for band practice, towards the end of my little practice a massive buzz was coming from the amp, like regular tone and volume, just a really loud buzz.
I fonzied it in "I did not spend £480 on something that's going to piss me off" anger and it cut the volume for a second (don't hit your amp >_> but the buzzing stopped and the volume returned and all that.

But yeah, is there anything to worry about?
Is this a sign of "The guy who sold you the amp knew it was ****ed so he loaded it off onto you"?
And are there any solutions?

(it wasn't any of my other gear btw)
#2
Have you considered turning down the bass on your eq? this happened to my Dad's amp on the A string, drove me crazy.
Comic




SAAAAAAAAANNNNNSSSS!!!!
#4
Was the amp plugged into a different power outlet than usual? It almost sounds like a grounding issue.