I didn't see this topic after a brief search, so here goes. My NanoVNA H3 (ver. 3.3) randomly reboots for no apparent reason, and it won't save configs. It's even happened when in DFU mode, fortunately I was able to jumper the BOOT and VDD pins and flash it a second time.
Doesn't matter if i'm holding it, or just letting it sit on a firm surface.
I've tried several different firmware versions, and it makes no difference whether it's running in standalone configuration, connected over USB, battery connected or not, powered by USB or thru battery.
I've tried wiggling the power switch to see if it's perhaps a cold / cracked / loose solder joint.
It also will not save its configuration; i.e. I can set it up to show certain traces, save the config, then after it reboots it goes back to the original config.
It works fine otherwise, I mainly use it to measure SWR, return loss, and use Smith charts between 3 and 30 MHz.
For what a replacement would cost, I'm not inclined to tinker with SMD components or reflow soldering the entire board. That being said, any ideas on a possible cause or fix?
Sometimes it will run for a couple of minutes before rebooting, sometimes 10 seconds...Seems completely random.
73 and thanks for any observations or tips concerning this!
