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Intel Wireless AX201, have problem connecting to AC 80Mhz channel width, no matter which channel it will give poor speed link connection performance, the maximum performance are only 173,3mbps which is 20mhz channel width, and have tendencies to lower the speed gradually over time, the wireless adapter can connect well with 2.4ghz N wireless mode, but if you have connection speed above 200mbps you can't maximize your connection,, the Intel Wireless AX 201 should be able to connect to AC wireless mode with maximum performance of 866mbps on 80mhz channel width but intel or the hardware can't,,
Intel need to release driver update or give explanation to this problems
since many router still in WIFI 5,, and WIFI 6 router are still expensive.

currently there is no fix about this problem except you are using external wifi adapter, or using Wifi 6 router (AX Wireless Mode).

if you have or solved this problem please let me know with comment