I went downstairs on my day off to play some tunes and get some practice.
Plug in to my Rumble 100 and was greeted by the sounds of silence.
Nothing, not even the pop when it starts up.
I jiggled the lead, I changed the lead, I tried with and without the Zoom pedal, I tried a guitar, nothing.
I grabbed a screwdriver and opened it up an looked at the amp, nothing odd, no smell of burning, the smoke had not been released.
Finally I phoned the guitar shop, they confirmed it was still under warranty and , sure bring it down.
Finally get down there when I pick up the boy from school.
Dude plugs it in and…silence.
He jiggles the pots and turns the bass dial to 11.
Booooooooooooooooooom.
Glorious bass notes are emitted.
We look at each other, “well that is odd” we say together.
no dramas, if it happens again bring it in and we will send it to Fender.
Get home and plug it in and it plays happily away like nothing happened and I didn’t take it for a drive.
Bastard!
That is strange. Hopefully, the problem has not happened again!
Welcome to living in the technological future (or poor quality recent past). For a more interesting conclusion, chock it up to ghosts haunting you from the great beyond, or those aliens everyone keeps talking about.
Did you have your coffee before you bring it to the shop? 
I’m glad it worked out for you.
It is an Aussie thing.
It is said that one of the most Australian things is to yell at a fly to Fuck Off! and expect it to listen
aaaaaaand it’s not working now.
Off to Fender it goes!
This could be heat thing. Maybe the chip just failed.
Send that bitch in
I haven’t powered up my Randall in probably ten years. It scares me to think of what might be living inside it. At the very least I will pull the cover and spray the pots with some happy juice. Sorry to read about these kinds of issues on newer gear.
If you do, let it air out a bit before putting the cover back on 
Well- it is off to Fender, if it comes back working I’ll be happy
Soooooo an interesting update here.
Fender and the music shop replaced that amp, and all seemed well in the world.
Until it wasn’t.
Last Jam the amp started cutting out and finally stopped working.
This was a new-in-box replacement.
I tried different cables, no Zoom pedal, everything, no joy.
I took it home, tried other cables, different power source, still no noise at all.
Not even noise on putting in or removing the jack.
Next morning I toddled off to the music shop and they were similarly baffled, they said it is odd to have not just one Fender Rumble die but two is unheard of- schools use these because they don’t die.
Anyway, they got another replacement, I told them I am losing faith in the brand and they agreed, if this one dies, we will try something else.
They called on Sunday and I picked it up on Monday.
The bass guy at the shop said he tested it, left it running for a bit and re-tested.
Anyway, it is home now, and I tried it out last night and it seems ok, but I am nervous now.
Here is the thing, it lives in my music room downstairs on a stand, plugged into a power board but turned off when not in use and even if I am leaving the room to do something.
When it died I was at someone else’s home using different power cables but ones I have used before (these are the ones I keep in my music bag and are new).
It only leaves the house every couple of weeks for jams and travels on the back seat in a way it doesn’t move around-in other words I baby it.
NFI why 2 have suddenly given up the ghost on me.