According  to MacWorld  there is a problem for users of Yosemite  which is 
causing problems with wireless
As i use ethernet wired with my iMac I have no experience of thee problems.
See 
http://www.macworld.co.uk/news/mac-software/apple-mum-as-mac-owners-tussle-with-yosemite-over-wi-fi-problems-3582611/
 
> On  25 Oct 2014, at 20:06, Jeff Berwick <[email protected]> wrote:
> 
> Thanks Tim.
> 
> There are no updates available and the problem is completely random.  I could 
> be in my mail getting messages, switch to Safari and then it goes out.  
> Sometimes I can get it back by selecting my network from the menu extras, and 
> sometimes I have to shutdown and it comes back.  It is very frustrating and, 
> from Googling, many others are having the same issue, but I haven't been able 
> to solve it completely yet.
> 
> Jeff
> 
>> On Oct 25, 2014, at 2:24 PM, Tim Kilburn <[email protected]> wrote:
>> 
>> Hi,
>> 
>> Check for any Software Updates.  Sometimes there are ones related to your 
>> Airport card or firmware that will remedy those occurrences.  If you're 
>> up-to-date already, then it's likely something different.  Is it happening 
>> in the middle of use or only upon Sleep or that sort of thing?
>> 
>> Later...
>> 
>> Tim Kilburn
>> Fort McMurray, AB Canada
>> 
>>> On Oct 25, 2014, at 9:03 AM, Jeff Berwick <[email protected]> wrote:
>>> 
>>> Hi there,
>>> 
>>> I upgraded to Yosemite and am having a pretty good time of it, but I lose 
>>> wireless connection from time to time.
>>> 
>>> I have tried starting my computer with command option p r pressed, I have 
>>> tried starting it with control shift power button pressed, but nothing has 
>>> made a difference.
>>> 
>>> Any other suggestions?
>>> 
>>> Thx,
>>> Jeff
>>> 
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