Hi All,
I have gotten this to occur when one of these two thing occurs:
o I turn on the NanoVNA with an antenna attached to the CH0 connector.
o The battery charge is low.
This may be conquencidental . Attaching the USB-C to the laptop or charger seems to resolves the issue for me.
I do not know if this is normal or not. I do not recall this happening when it was new.
73,
John VA3BOF