HI, I have a static IP as well.
I been printing with a USB today, after about 4 hours of running time and refreshing the local IP web page, it just started working again. Not sure what it is. Guess as creality does work and upgrades things might become more stable
I have this problem too. Support sent me a new mainboard, which I changed in a very stressful operation since the connectors are all very delicate and they are absolutely buried in glue.
New mainboard worked fine for a while, I thought the problem was fixed, and now I get the same issue again.
What sort of cheap junk can’t manage a wifi connection in 2024? I’d be less irritated if the geniuses had bothered to include an ethernet port on the K1C, but they didn’t.
If you’re reading this before purchasing, buy something else.