Xperia Z5 :: Drops Connection To Smartband SWR10 - Alarm Don't Start

In the last month I've experienced that my phone and smartband keeps dropping the connection. On the phone it shows as eather and x over the smartband icon, or that the SmartBand apps says 'Connecting' without anything happens. Some times it's enough to turn of the smartband other times i need to reboot the phone to get the connection up and running.
 
I've got all the altest SW for Z5 (32.0.A.6.200) - SmartBand (05.00.12 - 1.7.0.873) and Lifelog (2.9.A.3.8)Since I use the smartband to wake me up in the morning, it's very enoying that it don't work. Until now I've managed to wake up by myself...The phone is charging over night, and in the cradle, with the sound turned of. The phone is turned of with the exeption for notifications. The phone is set to vibrate and make a soft low sound. The Smartband is set to vibrate. If the connection is droped during the night, neighter the phone nor the smartband gives any indication on the alarm.
 
I've experienced that the phone and the smartband is vibrating, but there are no sound from the phone. Another version is that the phone is vibrating and making a sound, but the smartband don't vibrate. Before going to sleep i check that the phone is turned down, and that the connection to the smartband is OK.