Tried rebooting your router?

Sam

 <http://www.facebook.com/macambulance>  <http://www.twitter.com/macambulance>  
 <http://uk.linkedin.com/in/macambulance/>
MacAmbulance Ltd.
Providing Affordable Mac/PC Support and Web Development

Sam Mullen ACMT
+44 (0)7747778022
[email protected] <mailto:[email protected]>
www.macambulance.co.uk <http://www.macambulance.co.uk/>
MacAmbulance Ltd. is a registered company in England & Wales, registration 
number 8466597
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> On 22 Apr 2016, at 12:38, Philippe Chandless <[email protected]> wrote:
> 
> Hi Sam,
> 
> Yes. I’ve got 10.11.4
> 
> Philippe
> 
> 
> 
> On 22 April 2016 at 13:17:37, Sam - MacAmbulance ([email protected] 
> <mailto:[email protected]>) wrote:
> 
>> Are you up to date with El Capitan? It was a known issue until around 
>> 10.11.3 I think
>> 
>> Regards
>> 
>> Sam
>> 
>>  <http://www.facebook.com/macambulance>       
>> <http://www.twitter.com/macambulance>   
>> <http://uk.linkedin.com/in/macambulance/>
>> MacAmbulance Ltd.
>> Providing Affordable Mac/PC Support and Web Development
>> 
>> Sam Mullen ACMT
>> +44 (0)7747778022
>> [email protected] <mailto:[email protected]>
>> www.macambulance.co.uk <http://www.macambulance.co.uk/>
>> MacAmbulance Ltd. is a registered company in England & Wales, registration 
>> number 8466597
>> This email is intended solely for the addressed recipients and may contain 
>> privileged or confidential information. If you have received this email in 
>> error please notify the sender and delete the email immediately.
>> 
>>> On 22 Apr 2016, at 12:12, Philippe Chandless <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> 
>>> 
>>> Good afternoon,
>>> 
>>> Occasionally, on waking my MacBookPro (Late 2013) I get a message telling 
>>> me the hostname has been changed as the original one is already in use.
>>> Since yesterday it’s happened about a dozen times (as opposed to once a 
>>> fortnight before) and it’s becoming a nuisance. Nothing that I can think of 
>>> has changed on the Mac and there has definitely not been any change on the 
>>> network. 
>>> 
>>> The paranoiac inside me says that something external is to blame - should I 
>>> be worried?
>>> 
>>> Regards
>>> Philippe
>>> 
>>> 
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