Extremely slow Wifi when bluetooth mouse is not connected

[tastyminerals]

Reposting from jakeday/linux-surface#267

Extremely slow Wifi speed when bluetooth mouse is not connected.
Without bluetooth mouse speed is ~44 kb/s.
Wifi powersave is disabled.

Device: Surface Book 2
Kernel version: 5.3.15-1-surface (from https://github.com/dmhacker/arch-linux-surface)
Linux Distribution: Manjaro

Network device:

01:00.0 Ethernet controller: Marvell Technology Group Ltd. 88W8897 [AVASTAR] 802.11ac Wireless
	Subsystem: Device 0007:045e
	Kernel driver in use: mwifiex_pcie
	Kernel modules: mwifiex_pcie

Looks like the same mwifiex_pcie from this thread.

[dmhacker]

Maybe try installing the latest firmware? I just updated the setup script to properly work with qzed's changes. Select "yes" for option 4 and reboot.

[tastyminerals]

Thank you, but unfortunately is didn't help. The wifi is not usable wihthout bluetooth.