DSL-AX82U Issues -- ASUS Noob here.

[ToriGrace]

Hi everyone,

After consistent problems with my BT Smart Hub 2, for a long time... I finally upgraded to a the AX82U in hopes of a more stable and consistent connection.
I live in a very old with thick walls so I also have recent TP link power lines combined with wifi receivers in each floor of the house.
My ethernet speed has always been slow and will always be slow due to where the router has to be and the prehistoric wiring of the house.

My issue is the Wifi connectivity.
I have spent hours and hours reading forums of optimal settings for the 82U both specific for my ISP (BT infinity 2) and generic for the router - and have done what I believe is right.
Sometimes I will get very high speeds and wonderful performance and then all of sudden the connection will drop and the speeds will drop to 0-2mb/s
I noticed on the log something keeps happening and i have no idea if it is normal or even what it means.

:42 acsd: acs_set_chspec: 0x1009 (9) for reason APCS_CSTIMER
Dec 5 14:15:42 acsd: eth5: selected_chspec is 1009 (9)
Dec 5 14:15:42 acsd: eth5: Adjusted channel spec: 0x1009 (9)
Dec 5 14:15:42 acsd: eth5: selected channel spec: 0x1009 (9)
Dec 5 14:15:42 acsd: eth5: txop channel select: Performing CSA on chspec 0x1009
Dec 5 14:19:26 wlceventd: wlceventd_proc_event(527): eth5: Auth 54:AE:27:45:64:43, status: Successful (0), rssi:0
Dec 5 14:19:26 wlceventd: wlceventd_proc_event(508): eth6: Disassoc 54:AE:27:45:64:43, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0
Dec 5 14:19:26 wlceventd: wlceventd_proc_event(508): eth6: Disassoc 54:AE:27:45:64:43, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0
Dec 5 14:19:26 wlceventd: wlceventd_proc_event(537): eth5: ReAssoc 54:AE:27:45:64:43, status: Successful (0), rssi:-68
Dec 5 14:19:48 wlceventd: wlceventd_proc_event(527): eth6: Auth 54:AE:27:45:64:43, status: Successful (0), rssi:-68
Dec 5 14:19:48 wlceventd: wlceventd_proc_event(537): eth6: ReAssoc 54:AE:27:45:64:43, status: Successful (0), rssi:-68
Dec 5 14:19:48 wlceventd: wlceventd_proc_event(508): eth5: Disassoc 54:AE:27:45:64:43, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0
Dec 5 14:19:48 wlceventd: wlceventd_proc_event(508): eth5: Disassoc 54:AE:27:45:64:43, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0
Dec 5 14:19:55 wlceventd: wlceventd_proc_event(508): eth6: Disassoc 54:AE:27:45:64:43, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0
Dec 5 14:19:55 wlceventd: wlceventd_proc_event(508): eth6: Disassoc 54:AE:27:45:64:43, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0
Dec 5 14:20:25 wlceventd: wlceventd_proc_event(527): eth6: Auth 54:AE:27:45:64:43, status: Successful (0), rssi:-48
Dec 5 14:20:25 wlceventd: wlceventd_proc_event(537): eth6: ReAssoc 54:AE:27:45:64:43, status: Successful (0), rssi:-48
Dec 5 14:22:05 wlceventd: wlceventd_proc_event(508): eth6: Disassoc 54:AE:27:45:64:43, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0
Dec 5 14:22:05 wlceventd: wlceventd_proc_event(508): eth6: Disassoc 54:AE:27:45:64:43, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0
Dec 5 14:34:16 acsd: eth5: selected_chspec is 1001 (1)
Dec 5 14:34:16 acsd: eth5: Adjusted channel spec: 0x1001 (1)
Dec 5 14:34:16 acsd: eth5: selected channel spec: 0x1001 (1)
Dec 5 14:34:16 acsd: eth5: txop channel select: Performing CSA on

I can also show the DSL, WAN settings etc. if needed.

Do I downgrade to a previous firmware version?? I'm running the latest

Anyway I'd appreciate any help anyone can give me, if you'd like anymore information, I'd be happy to give it.
Thank you