+1 on Xperia X Compact SFOS 4.3.0.12 BT re-enabling still broken 
Maybe 4.4 gonna fix this annoying issue.
We should have held a birthday party for this ticket. It is already one year + 3 releases old
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@DrDweeb, @Sthocs, @Xeno_PL: Does the workaround @senders posted above solve the issue for you? It did for me (Xperia X).
@deloptes: Yes we should’ve have brought some 
to give it @senders for finding a solution. and a 
to @jovirkku for keeping this on his radar
Thanks senders! You’ve made my Bluetooth connected day(s)!
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Great that you pointed to the sanders analyses and solution - does it work on the 4.3? Because on the 4.3. it happens randomly that it does not work.
I mean from my perspective the issue is still not solved and there are other issues related to BT, where I opened other bug reports.
This is why I was so pissed that the software banned me, so I will not say anything bad … but only that I am very pissed. It happens that I have to remove pairing and pair again right after I start the car. This is frustrating and regression compared to previous versions.
I demand a sense for quality from Jolla. PLEASE!
And thank you all guys !
I am no expert to check it thoroughly but I think Jolla is working on it: see https://github.com/mer-hybris/bluetooth-rfkill-event/pull/8
it has been merged and is likely being tested. Not clear if it is coming along next update and if it solves the issue for all.
No @rozgwi, I don’t use BT that much anymore so I can wait for Jolla’s fix, but thanks for testing yourself! And congrats Jolla for actually making us so trendy 
: Why I'm thrilled that wired headphones are 'trendy' again
Thank you for the liberal enema and confirming that I have been always trendy, however the jack on the Xperia X is very sensitive and does knuckle all the time which makes volume go up and down. The jack on the 10 II is better, but also knuckles although the phone is few months old and I almost did not use it.
Ah and before you tell something. I tried different jacks, excluding golden ones 
Also I would never wear something wireless close to my brain (remember 1in distance according FCC AFAIR). But for the car BT is the best choice.
Thank you also for the link. I could at least test this and adopt it if it works until it goes into the main branch
It seems, that’s the culprit, after BT is disabled, hciattach process stays on. Killing it manually allow BT to start properly next time and successfully connect to the other devices.
So yep, workaround works
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At my phone, bluetooth is behaving as normal after enabling flight mode, if there has been no bluetooth device connected to it during enabling the flight mode.
if a device is connected duri g enabling the flight mode, I cannot turn BT on again after enabling the flight mode and a restart of the phone is needed.
So my workaround is:
Switch of my BT headphones, than switch on flight mode, switch on BT again and switch on the headphones again. No problems with this sequence so far.
But of course it is a workaround and should not be an intended behaviour 
Have you tried another workaround, namely Sailfish Utilities?
There is a tool to restart the Bluetooth subsystem.
No, restarting BT with the utility has not solved the issue in such situations.
Are you using 3.4?
This was broken in the version. Get an older or newer one.
No, I’m on 4.5.0.24. Missed to add this information.
I dont know if others have noticed (or Jolla) but…
I reflashed twice.
Once an old 3.2.x.x, and upgraded with ‘Sailfish Updates’, up to the current 4.5.0.24 version. On this version, bluetooth never -not even once- turned on without restarting(twice or more) from Utilities.
Second time, reflashed directly 4.5.x.x(1 small 50mb update to 4.5.0.24)… Bluetooth worked everytime without ever restarting from Utilities.
Note: For some reason, using the patch ‘Restart BT in SF Utilities’ that adds restarting bluetooth to ‘Network’ restart, worked better(for me anyways) than the dedicated option implemented by Jolla
I also observe this behaviour with version 4.5.0.24 on XA2 Ultra. I have to restart Bluetooth every single time I try to use it.
Is it the same hardware in both cases?
and please post which hardware you are using. It is hard to find in the history
Yes my bad, I totally forgot to mention hardware.
Its an XA2 dual sim. Both cases on the same phone.