it seems that this set of messages repeats. I wonder if it's every time the adapter disappears from TVHeadend. those are today's messages, but it's similar from yesterday when I tested plugging and unplugging the tuner from USB hub directly to HC4 port and back again. so perhaps every time the USB hub somehow loses power the adapter disappears from TVHeadend.
[Mon Dec 6 10:11:49 2021] usb 1-2.3: usbfs: USBDEVFS_CONTROL failed cmd mediasrv rqt 64 rq 2 len 1 ret -71
[Mon Dec 6 10:11:49 2021] usb 1-2.3: usbfs: USBDEVFS_CONTROL failed cmd mediasrv rqt 64 rq 2 len 1 ret -71
[Mon Dec 6 10:11:49 2021] usb 1-2.3: usbfs: USBDEVFS_CONTROL failed cmd mediasrv rqt 64 rq 2 len 1 ret -71
[Mon Dec 6 10:11:49 2021] usb 1-2.3: usbfs: USBDEVFS_CONTROL failed cmd mediasrv rqt 64 rq 2 len 1 ret -71
[Mon Dec 6 10:11:49 2021] usb 1-2.3: USB disconnect, device number 55
[Mon Dec 6 10:11:49 2021] usb 1-2.3: new high-speed USB device number 56 using xhci-hcd
[Mon Dec 6 10:11:49 2021] usb 1-2.3: New USB device found, idVendor=2659, idProduct=1502
[Mon Dec 6 10:11:49 2021] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[Mon Dec 6 10:11:49 2021] usb 1-2.3: Product: SkyTV Ultimate 6 2016/Q1
[Mon Dec 6 10:11:49 2021] usb 1-2.3: Manufacturer: Sundtek
[Mon Dec 6 10:11:49 2021] usb 1-2.3: SerialNumber: U171212190229
[Mon Dec 6 10:11:49 2021] usb 1-2.3: Unsupported device
[Mon Dec 6 10:11:49 2021] usb 1-2.3: Unsupported device
[Mon Dec 6 10:11:49 2021] usb 1-2.3: Unsupported device
[Mon Dec 6 10:11:49 2021] usb 1-2.3: Unsupported device
[Mon Dec 6 10:11:49 2021] usb 1-2.3: Unsupported device
[Mon Dec 6 10:11:49 2021] usb 1-2.3: Unsupported device
[Mon Dec 6 10:11:49 2021] usb 1-2.3: Unsupported device
[Mon Dec 6 11:59:11 2021] docker0: port 1(vethd684a46) entered disabled state
[Mon Dec 6 11:59:11 2021] veth1d78fb8: renamed from eth0
[Mon Dec 6 11:59:11 2021] docker0: port 1(vethd684a46) entered disabled state
[Mon Dec 6 11:59:11 2021] device vethd684a46 left promiscuous mode
[Mon Dec 6 11:59:11 2021] docker0: port 1(vethd684a46) entered disabled state
[Mon Dec 6 11:59:11 2021] docker0: port 1(vethfec4937) entered blocking state
[Mon Dec 6 11:59:11 2021] docker0: port 1(vethfec4937) entered disabled state
[Mon Dec 6 11:59:11 2021] device vethfec4937 entered promiscuous mode
[Mon Dec 6 11:59:11 2021] IPv6: ADDRCONF(NETDEV_UP): vethfec4937: link is not ready
[Mon Dec 6 11:59:11 2021] docker0: port 1(vethfec4937) entered blocking state
[Mon Dec 6 11:59:11 2021] docker0: port 1(vethfec4937) entered forwarding state
[Mon Dec 6 11:59:12 2021] eth0: renamed from vetha074485
[Mon Dec 6 11:59:12 2021] IPv6: ADDRCONF(NETDEV_CHANGE): vethfec4937: link becomes ready
[Mon Dec 6 11:59:13 2021] amlogic-pcie-v2 fc000000.pcieA: the device class is not reported correctly from the register
[Mon Dec 6 11:59:16 2021] usb 1-2.3: usbfs: process 103060 (mediasrv) did not claim interface 0 before use
[Mon Dec 6 11:59:30 2021] usb 1-2.3: usbfs: process 103067 (mediasrv) did not claim interface 2 before use