Fluctuating voltage on smd capacitor - is it normal?

[xboxgamer]

My Viofo V2 dashcam died. No power, no lights, nothing, completely dead.

I took it as an opportunity to try and fix it myself.
There is no shorted capacitor on the board so I started to measure voltage on some elements.

And I found something potentially weird but since I'm a total beginner I decided to ask here.

I connected dashcam to my power bank to supply 5V.
There are a lot of capacitors on the board. Most of them show 0v on one side since it's ground and they show sometimes 4.7v on one side, on another it shows 2.5v but the thing is that the voltage is stable.

Now, I found approx 5 caps that don't show stable voltage. When measuring them using my multimeter one side shows 0v as expected but the other side of cap shows voltage dropping the more I hold my probe on it. It starts with approx 2v and quickly drops to 1.8,1.7.1.4... and drops to 0.7v, 0.6v etc.

Is it normal? I suppose it should stay stable but it's like cap is discharging while I measure voltage on it.

What could be the reason for that?

Thanks

[LooseJunkHater]

Your multimeter does actually have resistor(s) inside which is what is draining the capacitors of the device under test.

What's likely happening as that quickly upon plugging in/turning on the dashcam, those caps charge up, and then the dashcam shuts off for whatever reason, leading to those caps slowly draining.

If you have a picture of the PCB, we may be able to point you in the right direction for what's wrong.

[MathWizard]

Can you measure the current into the device with your meter ? Depending on the power plug, you might have to solder on a wire. If you meter didn't have current, you could use a really small resistor in series, like a a 1 ohm. It might get really hot, really quickly tho, depending on the current.

Are there any chips near the power in ? Most things these days would have some step down voltage converter(s), with inductors. Have a look around at all the chips, see if they are labelled, look up their Vcc, and you could try to figure out the voltage rails from that.