Tony -
Thank you for your input - but I don't even have a 'ByHost' folder in /Library/Preferences/ ...
Since I am not an Apple hotshot, I take the liberty of enclosing a few lines from my Sharing Daemon log file, which to my uninitiated eye suggests that 'something' is going on, amongst others a lot of discovering, disabling & shutting down. Can anyone help me decipher this, please?
...
2015-10-28 08:44:34.462 sharingd[5721:1470983] 08:44:34.462 : BTLE discovered device with hash <01ad22c0 0a1db300 0000>
2015-10-28 08:44:34.462 sharingd[5721:1470983] 08:44:34.462 : Hash <01ad22c0 0a1db300 0000> exists in contacts
2015-10-28 08:44:34.462 sharingd[5721:1470983] 08:44:34.462 : BTLE scanning stopped
2015-10-28 08:44:49.466 sharingd[5721:1470983] 08:44:49.466 : BTLE scanning started
2015-10-28 08:44:49.466 sharingd[5721:1470983] 08:44:49.466 : Scanning mode Contacts Only
2015-10-28 08:44:49.467 sharingd[5721:1470983] 08:44:49.467 : BTLE scanner Powered On
2015-10-28 08:45:04.464 sharingd[5721:1470983] 08:45:04.464 : AirDrop server idle timeout
2015-10-28 08:45:04.464 sharingd[5721:1470983] 08:45:04.464 : AirDrop server disabled
2015-10-28 08:45:04.464 sharingd[5721:1470983] 08:45:04.464 : BTLE scanning stopped
2015-10-28 08:45:04.465 sharingd[5721:1470983] 08:45:04.465 : BTLE scanning started
2015-10-28 08:45:04.465 sharingd[5721:1470983] 08:45:04.465 : Scanning mode Contacts Only
2015-10-28 08:45:04.465 sharingd[5721:1470983] 08:45:04.465 : AirDrop server terminated
2015-10-28 08:45:04.465 sharingd[5721:1470983] 08:45:04.465 : Bonjour advertise stopped
2015-10-28 08:45:04.466 sharingd[5721:1470983] 08:45:04.466 : BTLE scanner Powered On
2015-10-28 08:45:04.876 sharingd[5721:1470983] 08:45:04.875 : Terminate AirDrop P2P link
2015-10-28 15:26:42.930 sharingd[5721:1470983] 15:26:42.929 : Purged contact hashes
2015-10-28 15:26:42.936 sharingd[5721:1470983] 15:26:42.936 : Discoverable mode changed to Off
...
In desparation ------------------/Ivan