Well Dave I may have spoken too soon.  To answer you question I added the capacitor across the output +/- from the BEC.  To test it I had things clipped together and it was working for a long time and then the camera stopped again but it may have been because the connections came loose.

I need to solder everything better and try it again

What else is connected to the IOTiny? Is your bec just a linear voltage regulator? Is it 3.3v or 5v? I'm confident the behavior you explain sounds like the IOTiny is browning-out. That means it is not getting enough current to maintain operation. With an IoTiny and a camera, it requires a small current. I forget the amount, but it's like 100mha or something, maybe less. But they'll also draw current if you have servos and stuff connected to the i/o.

120mha with camera the datasheet says: https://synthiam.com/uploads/1/2/6/9/126941806/iotinydatasheet-636966456964424276_1.pdf

DJ I am feeding the BEC with 11.1 volts at 8 amps the output on the BEC is set to 6v to the IOTiny.  I have three servos attached to it and the camera.   My bench supply tells me it using less than 1amp with the camera running and the servos just holding position.

before I had the capacitor installed the camera would disconnect right after it was started.  When I had it installed with a makeshift connection it seemed to work for a long time.  But with the head tracking moving things around I thing the connection may have disconnected cap and the camera turned off note when this happens the connection to the IOTiny stays connected.

tomorrow I hope to setup a better test where I can provide more information.

also note this is a BEC not a buck converter

Yeah it's browning out if you have servos connected to the bec. What's the bec? A linear voltage regulator? My guess it has a 7805 vr in there. That’s only good for 200-400mh before overheating. 1 amp draw through the bec is a lot.

Here's an idea. Disconnect the servos and try it.

If you get to the point of needing a new and better BEC I have a suggestion.

I found a great little Bec 10A 6S Switching Regulator by Castle Creations. I use these in my B9 arm and they are a real powerhouse. They are super small (only about 1 inch x 1/2 inch), programmable output voltage (with using an extra unit you have to buy). They run cool and will handle up to 10 amps draw. Here's the specs:

*1.2" (30mm) x .6" (15mm) x .4" (10mm) , Weight: .4oz (11g)
*Input voltage: 5V to 25.2V (2S to 6S LiPo)
*Current output: 12 volts input = 7 amps continuous, 10 amp peak
*Current output: 24 volts input = 5 amps* continuous, 7 amp peak
*Selectable Output: 4.8 - 9.0V via the Castle Link (sold separately), Default voltage is 5.1V

Here's a link to them on Amazon: https://www.amazon.com/gp/product/B000MXAR12/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

On a side note, You may want to run your power directly to the servos from the power source and bypass the IoTiny completely. Just run the signal wire from the IoTiny. I've had brownouts like you are seeing when running servo power through an EZB or IoTiny. Servo's will draw much more current when starting up to move and starve the IoTiny then when holding load or sitting idle. I've tried placing Super Caps on the EZB like you tried with poor results.

Oh I have talked about using these in the past. They’re for automotive use but super high amperage. This one goes to 20 amps or something:

DC 12V 24V 36V 48V 58V 60V 72V 80V 90V to 5V Step-Down Converter car Battery or Switching Power Supply Buck 5V Constant Voltage (8V-58V to 5V2A(ZS)) https://a.co/d/aqO34gu

I am using the following

US $14.80 20 Off | Mayitr 1pc UBEC-8A 6V-36V 2-8S LiPo Independent Power Supply Module BEC/UBEC Ssteering Gear/Receiver RC Car Part https://a.aliexpress.com/_msRLJE4

This should not have any problem with powering things.