Certainly not a computer expert, but consider the option that the battery on your motherboard might be running low. If the hardware itself is older, I would try swapping the button cell. I’ve seen many weird issues get resolved this way, although in theory it should not mess up anything but system time.
Neither can I, but it might be a combination of several issues. Like I said, if the cell is older (and you can reach it easily) just swap it, should be a 2032 (aka THE button cell). If it works, perfect, if it doesn’t no harm was done.