VoIP phones losing connection randomly for a brief moment

So back story here. Just installed two SG200-26 switches (replacing a unmanaged switch) which are connected together via a trunk.
However my SPA921 VoIP phones randomly have the Mic light flash red (which indicates loss of network connection). It happens for a literally a second and reconnects. When pinging the phone you can see a single ping not getting a reply. It also appears randomly on what seems to be most of the phones but not all at the same time, some may be fine while maybe one or two have the issue. It may have it continuously loosing connection for a brief moments for a while then likewise it my be fine for a while or the rest of the day.
Im looking for some ideas for troubleshooting. So far I tried changing the phone ports to static 10M half duplex instead of autosensing and this seems to not have resolved the issue.
Your help is appreciated.
Thanks
Liam

This was one of the ports I was having a problem with, It went down and up becuase I had done a Admin Shutdown on it. However what is it refering to by 'Aggregated'?
2147483158
2013-Aug-28 17:18:32
Informational
%LINK-I-Up: gi15, aggregated (3)
2147483159
2013-Aug-28 17:18:20
Warning
%LINK-W-Down: gi15, aggregated (3)
Also brief loss of connection happens even when not going through the trunk

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VoIP phones losing connection randomly for a brief moment

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