Bluetooth turns off automatically from time to time

Hi,
my Z1Compact is on Kitkat, I bought it and before using it I updated to Kitkat and also did the .757 update when it was out. I have Bluetooth always on, but it is only connected to the hands-free car kit for 30-60 minutes in the morning and then again in the evening.
I recognized in the last weeks that Bluetooth switches off automatically/ on its own from time to time, maybe once in 1-3 days - I can switch it back on and it stays on, no matter if connecting/ disconnecting the car or connecting/ disconnecting to the charger; but then I suddenly see that Bluetooth is off again. Battery NEVER was below 50%, normally more than 70% as I don't use it often...
Today again: I got into the car and after two minutes I recognized that the car was not connected with the phone. I looked at the phone (just at the lock screen) and Bluetooth was running. I selected the phone from the Bluetooth menu of the car and tried to start the connection "manually" - the car finally gave up. After some minutes I looked at the phone again a saw that Bluetooth was switched off - although I didn't touch it during that time...!!! I switched Bluetooth on again and everything was fine...
This is quite annoying because when I'm in the car I would like to be able to rely on the hands-free car kit
Has anyone an idea?
Thank-you very much!

Hi,
I bought my Z1c two weeks ago and with first start it was updated to Android 4.4.2, Build Nr. 14.3.A.0.681 - so I do not have any comparison to older Android versions...
I charge the phone in the evening (100% battery) and leave it overnight unused. In the morning (after 8,5h) only 80% battery are left - this is NOT normal!?! The signal strength is 3/4, WLAN is OFF, Bluetooth is ON.
Bluetooth: I use it only in my car. In the night the car is in the garage - and of course switched off, and I see no BT connection on the phone.
But I thought BT could be the problem, so I switched it off on the phone. And now it gets really strange (at least for me):
BT ON: After 8,5h battery on 80%, according to Kitkat battery overview BT used 51% battery (CPU 2h23m, active 8h)
BT OFF (!!!): After 11h battery on 79%, according to Kitkat battery overview BT used 51% battery (CPU 2h18m, active 10h)
I installed the GSAM battery monitor app (for me again strange):
BT ON: After 8,5h on battery it shows Bluetooth 1,2%, App usage 90,5% (Kernel Android is 89,8%)
BT OFF: After 11h on battery it shows Bluetooth 0%, App usage about 80% (Kernel Android was also about 80%)
==> What drains the battery?
==> Why is Bluetooth shown with 50% in Android battery overview, even when it is switched OFF?
==> Why does GSAM battery monitor shows only minor battery usage by Bluetooth?
Additional info:
I rebooted the phone at least three times in the last days - nothing changed
I use NO facebook apps or others like this
I have only about 4 (!) apps installed - all (!!!) were used on my old HTC Desire S (Android 4.x?) with great battery life
WLAN is switched OFF all the time
Auto-sync is switched OFF
So what can I do???
Thank-you very much!

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