Chirping noise from Home Hub 3!

Sorry about the rather vague subject title, but since a reboot early this morning (following a local BT exchange problem yesterday) my new Home Hub 3 keep making small 'chirruping' noises!
A bit like the sound Nokia mobile phones make when their batteries are getting low, but quieter than that... I probably only hear it because it is about a metre or so away from me!
I have certainly never heard it before, and wondered anything to be concerned about, or is it some sort of resynchronisation procedure perhaps?
Has anyone else noticed anything similar?

Montala wrote:
Hi,
Sorry for not having replied on here before,
Had a chuckle at some of the comments, but things seem to have quietened down a bit now, so perhaps the baby birds have finally flown the nest!
My Home Hub seems to be working well at present anyway, so all I want now is for BT to lay about 3 miles of fibre optic cable from our nearest exchange to the cabinet immediately outside my house, and I shall be a very happy bunny!
Hi Montala,
Glad you took it in good heart, but you can see we couldn't miss the oportunity.
As regards the fibre cable, You never know
toekneem
http://www.no2nuisancecalls.net
(EASBF)

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I can't find the solution to this anywhere so here goes:
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Solved!
Go to Solution.

After trying lots of ideas, I think I now have a solution and some idea of what may be causing the problem. I hope this explanation may be of help to anyone else facing a similar problem.
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Rupert.

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See
Reported problems with the Home Hub 2.0
There are some useful help pages here, for BT Broadband customers only, on my personal website.
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