successful disassociation to SSID

[Ab79]

User is facing disassociation from the Access-point without roaming, also there is no other Access-Point on this area, so not sure why it is disassociated

[RWelch]

Disassociation often occurs when the client device has left the AP or potentially gone into a hibernate state (or powered down state) or chosen to roam to another AP.

802.11 Association Process Explained 

[PhilipDAth]

Try updating the WiFi driver on the machine.