I chatted with Asus Tech Support. This is what they said about the log entries:
The log entries WLC_SCB_DEAUTHORIZE error (-30) and WLC_SCB_DEAUTHENTICATE_FOR_REASON err -30 in your ASUS RTBE96U router logs are strong hints that your WiFi crashes are caused by the router forcibly disconnecting (deauthenticating/deauthorizing) wireless clients. These errors specifically indicate an internal failure within the wireless controller (WLC) software/firmware when trying to maintain a stable connection with a specific device (the SCB - Station Control Block). The -30 error code generally points to an internal state or memory management problem within the router's operating system (likely ASUSWRT/Merlin).
anyone else have these log entries frequently? or should I send this piece of crap back to the seller?