RPI5 WIFI problem

    I’m having an issue with the Wi-Fi on my Raspberry Pi 5. Occasionally, it displays a message saying that the Wi-Fi password is incorrect. This happens across multiple Raspberry Pi 5 devices that I own. Could the problem be related to the modem/router, LibreELEC, or is the wireless connectivity on the Raspberry Pi 5 just poor? This never happened with the Raspberry Pi 4, it is really annoying

    Devices need to use passwords when connecting and/or reauthenticating to the network. This happens in normal use. It happens a lot more frequently when signal/connectivity is poor; and RPi boards generally have poor(er) connectivity before we place them into cases that reduce it further. So the short answer is "nobody knows" (could be any and all of the items you've listed) but if the issues reduce when moving boxes closer to the router, it's probably the normal issues seen with RPi boards, and the solution(s) are moving things closer, using an external wifi dongle with better connectivity, using ethernet instead of wifi, etc. etc.