I have Acer Aspire A315-42G with the same WiFi adapter and suffer from the same 
bug. On Windows 10 I get 200Mb/s download speed (limited by Internet provider, 
sorry, don't have anything else to test on LAN), on Ubuntu 20.04 at the same 
spot I get 30Mb/s download speed. My region settings:
$ iw reg get
global
country RU: DFS-UNSET
        (2400 - 2483 @ 40), (N/A, 20), (N/A)
        (5150 - 5350 @ 160), (N/A, 20), (N/A), NO-OUTDOOR
        (5650 - 5850 @ 160), (N/A, 20), (N/A), NO-OUTDOOR
        (57000 - 66000 @ 2160), (N/A, 40), (N/A), NO-OUTDOOR

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https://bugs.launchpad.net/bugs/1867559

Title:
  Qualcomm Atheros QCA9377 wifi 802.11ac very unstable and low speed

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