‘No WiFi Adapter Found” even with driver running

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A few weeks ago, my wifi signal was bad. I’ve set a few options in /etc/modprobe.d/ath9k.conf and I’ve got a little improvement. Now my signal started again to drop randomly, and I’ve tried to install backport-iwlwifi. Now the Wifi icon doesn’t appear at all, and when I check ‘settings -> Wifi’ I get the following message: No WiFi Adapter Found.
When I try sudo modprobe -r ath9k I get modprobe: FATAL: Module ath9k is in use. That has never happened to me.
I’ve tried to reinstall ath9k and Linux firmware, but it didn’t work.
My Linux: 5.3.0-51-generic #44~18.04.2-Ubuntu SMP Thu Apr 23 14:27:18 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux.
I don’t know what info may help, so here are a few of them:
Output of ifconfig:
enp7s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet netmask broadcast
inet6 fe80::adb6:b0b5:d21d:6170 prefixlen 64 scopeid 0x20<link>
ether f4:8e:38:e7:00:47 txqueuelen 1000 (Ethernet)
RX packets 76950 bytes 79761945 (79.7 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 73083 bytes 17147217 (17.1 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet netmask
loop txqueuelen 1000 (Local Loopback)
RX packets 11732 bytes 1151613 (1.1 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11732 bytes 1151613 (1.1 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

Output of sudo lshw -C network:
description: Network controller
product: QCA9565 / AR9565 Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: [email protected]:06:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom
configuration: driver=ath9k latency=0
resources: irq:18 memory:f7100000-f717ffff memory:f7180000-f718ffff
description: Ethernet interface
product: RTL810xE PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: [email protected]:07:00.0
logical name: enp7s0
version: 07
serial: f4:8e:38:e7:00:47
size: 10Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full firmware=rtl8106e-1_0.0.1 06/29/12 ip= latency=0 link=yes multicast=yes port=MII speed=10Mbit/s
resources: irq:19 ioport:e000(size=256) memory:f7000000-f7000fff memory:f0000000-f0003fff

Output of lspci | grep Network:
06:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter (rev 01)

Output of rfkill list all
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no

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