Just restarting systemd service helped…
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I’ve tried systemctl restart systemd , but does not seem to be the correct command.
Could you share the actual command?
In my original post, just to read more deeply 
In my case, the Xperia X dual SIM, it looks like this
when BT is off
● bluetooth.service - Bluetooth service
Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; disabled; vendor preset: enabled)
Active: active (running) since Thu 2021-02-18 15:44:56 CET; 21h ago
Docs: man:bluetoothd(8)
Main PID: 777 (bluetoothd)
Status: "Running"
Memory: 1.3M
CGroup: /system.slice/bluetooth.service
└─777 /usr/libexec/bluetooth/bluetoothd -n
feb 19 13:19:15 Sailfish bluetoothd[777]: bluetoothd[777]: Loading LTKs timed out for hci0
feb 19 13:19:15 Sailfish bluetoothd[777]: Loading LTKs timed out for hci0
feb 19 13:24:00 Sailfish bluetoothd[777]: bluetoothd[777]: Failed to set mode: Not Powered (0x0f)
feb 19 13:24:00 Sailfish bluetoothd[777]: bluetoothd[777]: Failed to read advertising features: Unknown Command (0x01)
feb 19 13:24:00 Sailfish bluetoothd[777]: bluetoothd[777]: hci0 Load Connection Parameters failed: Unknown Command (0x01)
feb 19 13:24:00 Sailfish bluetoothd[777]: bluetoothd[777]: Failed to get connections: Not Powered (0x0f)
feb 19 13:24:00 Sailfish bluetoothd[777]: Failed to set mode: Not Powered (0x0f)
feb 19 13:24:00 Sailfish bluetoothd[777]: Failed to read advertising features: Unknown Command (0x01)
feb 19 13:24:00 Sailfish bluetoothd[777]: hci0 Load Connection Parameters failed: Unknown Command (0x01)
feb 19 13:24:00 Sailfish bluetoothd[777]: Failed to get connections: Not Powered (0x0f)
when BT is on
● bluetooth.service - Bluetooth service
Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; disabled; vendor preset: enabled)
Active: active (running) since Thu 2021-02-18 15:44:56 CET; 21h ago
Docs: man:bluetoothd(8)
Main PID: 777 (bluetoothd)
Status: "Running"
Memory: 1.3M
CGroup: /system.slice/bluetooth.service
└─777 /usr/libexec/bluetooth/bluetoothd -n
feb 19 13:19:08 Sailfish bluetoothd[777]: bluetoothd[777]: Endpoint unregistered: sender=:1.42 path=/MediaEndpoint/A2DPSource
feb 19 13:19:08 Sailfish bluetoothd[777]: bluetoothd[777]: Endpoint unregistered: sender=:1.42 path=/MediaEndpoint/A2DPSink
feb 19 13:19:08 Sailfish bluetoothd[777]: Endpoint unregistered: sender=:1.42 path=/MediaEndpoint/A2DPSource
feb 19 13:19:08 Sailfish bluetoothd[777]: Endpoint unregistered: sender=:1.42 path=/MediaEndpoint/A2DPSink
feb 19 13:19:12 Sailfish bluetoothd[777]: bluetoothd[777]: Endpoint registered: sender=:1.42 path=/MediaEndpoint/A2DPSource
feb 19 13:19:12 Sailfish bluetoothd[777]: bluetoothd[777]: Endpoint registered: sender=:1.42 path=/MediaEndpoint/A2DPSink
feb 19 13:19:12 Sailfish bluetoothd[777]: Endpoint registered: sender=:1.42 path=/MediaEndpoint/A2DPSource
feb 19 13:19:12 Sailfish bluetoothd[777]: Endpoint registered: sender=:1.42 path=/MediaEndpoint/A2DPSink
feb 19 13:19:15 Sailfish bluetoothd[777]: bluetoothd[777]: Loading LTKs timed out for hci0
feb 19 13:19:15 Sailfish bluetoothd[777]: Loading LTKs timed out for hci0
Sending contacts from the People app to another device (Gemini PDA) via BT works.
Sending a file from the File Browser to the same device does not work.
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I’ve tried that also, but thought that you meant something more stronger/harder, because I reboot doesn’t help either.
It looks like I’m enjoying another issue with the same effects…
Thank you all for the detailed info about this problem. We have a bug report now.
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Came here to see if somebody else is experiencing this after Koli update, was not disappointed
Restarting the BT service on my Xperia X doesn’t work (same RFKILL messages) but restarting the device makes BT work once; after a disconnect or toggling BT on/off it gets stuck and won’t budge until restart.
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I’m having the exact same problem after upgrading to SFOS 4 (Koli). Bluetooth works fine once, then gets stuck after trying to enable it a second time. Only rebooting resolves the issue. Using an Xperia X and everything worked as ist should before the upgrade.
I also have the exactly same problem in two XPERIA X (single and double SIM). Bluetooth works once. After disconnecting the headphones they cannot be reconnected. Only rebooting helps – but also not always. The headphones work perfectly with other devices.
I have noticed the same problem with my Xpreria X. Bluetooth used to work like a charm, but now only once and reboot needed to (maybe) have it work again. Got headphones with a cable as a “workaround”.
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Restarting the bluetooth service (bluez) is only half the solution and for me does not fix the issue when it occurs (on XA2). I also need to restart bluebinder.service for bluetooth to work again.
So I found out is has to do something with bluetooth.service as well as bluetooth-rfkill-event.service. After bluetooth fails to work when trying to enable it the second time, I did the following:
- Killed the bluetooth-rfkill.service
- Restarted bluetooth.service
- Restarted bluetooth-rfkill.service
- Turned on bluetooth via Settings as usual. And the it works again (for one time :)).
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The service to kill on my phone is called bluetooth-rfkill-event.service
sorry, i dont read all thread, but with same problem restarting bluebinder helps me
devel-su
systemctl restart bluebinder
I do not exactly know at which version it changed.
But on 3.2 a
devel-su systemctl restart bluetooth bluebinder
works.
On 4.0 I guess then a
devel-su restart bluetooth bluetooth-rfkill-event
should do the trick as well?
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on 4.0 i already has this bag, and restarting bluebinder works well
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Yes.
Checked on different devices.
bluebinder is only present on devices with Android runtime installed
So something above is true 
–
maybe then?
devel-su restart bluetooth bluetooth-rfkill-event bluebinder
Could someone at Jolla add this bluetooth reset to the Jolla Utilities? That would be super useful.
And an Android on/off switch for the events view? Thank you ;-p
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I think the best way is to make sure it works the right way without ever having the need to restart the service in the first place.
Yes I have this problem addition to loosing wlan and mobile network regularly. Irritating problem when you rely being reachable but the phone has dropped silently out of all connections.
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Are there users with an Xperia 10 experiencing the same issue or is it restricted to X, XA2 ?