It could be a bulb with a broken filament, any vibration and they spark and light up and keep going. I have one I tap with a pen and it works, for 2 years now lol.
Ikea used aluminum crimp connectors in their desk lamps, these are notorious for bad connections. I salvaged 5 out of the garbage lol, I like 10W and 20W peanut halogen lighting, put in copper crimp connectors.
Your bathroom has moisture too, so all connections might be corroding.
What is the power supply? SMPS or transformer? That could do it as well if the SMPS needs capacitors replaced.
This type of lamp with the two small pins is notorious for developing a bad connection!
Either the pins oxidize or the contact receptacle do, or the springs in the receptacle become too weak causing this flicker...
"The one who says it cannot be done should never interrupt the one who is doing it."
Yes this can happen for the reasons given already lamp sockets are notorious for bad connections on the pins especially the plastic housing ones the ceramic ones are better but they are prone to the same type of issue
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
You are worried about one flicker? What were you drinking?
It could even be a mains sag or brownout that you saw- nothing to do with the light fixture.
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