Here are explanation on the requested disconnect reason codes:
DisconnectReason = 7
Deauthentication frame with reason code 7. This radio is informing the other radio to deauth because there isn't an association. It's likely a client is sending an access point frames while not having an association with this access point.
DisconnectReason = 8
The sending UE/client is leaving/left the BSS voluntarily.
Hope this helps.