Now that you bring this up, it happens way more when I use an older charger with an A-C cable. (The C port on this charger was always acting weird, that’s why I only ever use it’s A port)
And happens waaaay less, or almost never when I use a fast charger with a C-C cable. I always plug into port 1.
As of random time of day… Not really? Happens any time I plug in, as far as I can tell. But I never really paid attention to it, to be honest.