I installed the new MoodleBox image with 64bit to test it together with all my normal content.
Today I could connect 9 mobile devices to my MoodleBox running on a Raspberry Pi 4B (4GB RAM). I tried to connect more but on all additional devices I got the same error. "Could not connect."
Again I logged the signal history with my Android WifiAnalyser (com.vrem.wifianalyser). It's open source. You can get it for free from F-Driod. The MoodleBox wifi was stable without any break during the two hours of testing.