IMessage problems after iOS6 update

Question

Hi All,
Is anyone getting similar problems to this after iOS6 updates?
My iPad is used on 2 wifi networks, my home network and work wifi, I pick the pad up on a morning, shove it in my bag, go to work and pick up the wifi there, carry on as normal, repeat in reverse when heading in the opposite direction.
On iOS5, my iMessages would simply carry on the conversation when rejoining either network *there is no 3g connection on this ipad*
Since updating, I leave for home, get to work and iMessage refuses to resume, messages stick at about 90% sent, then fail, I head home , rejoin the home network and boom, it just picks up where it left off
When at work, occasionally it might start working after 10 minutes or so, but today i've been sat about 5 hours so far, no dice
I have tried just about every combination of restarts, resets, updates I can think of, including, changing the DNS on my device to the same one I use at home *8.8.8.8* , shutting iMessage down, renewing the DHCP lease, Hard resets, soft resets ,  forget wifi network, restore network setting  you name itI've tried it
Under iOS5 I had used the device for months without doing so much as a power down and not had one single 'not delivered' failure on an iMessage, since iOS6 I've probably had abotut 50% service from this.
As far as I know, nothing has changed on either wifi networks, everything else works fine on the works network, browings, itunes, app store, skype etc etc.
I'm at a loss as to what to do next, and yes, I've also done a full device restore as well for good measure, with a iCloud back up, again, it restored, went to messages and it just sat there doing nothing until I got home , where the messages just sent first go.
Massively frustrated in what I can only see as something that's been introduced as a result of this iOS6 upgrade.

Answer 1

I may have found my own answer... it seems that anything less than 3 bars of wifi signal after rejoining a network and the message wont send, I switched my device off, moved closer to the wifi router, tricky as it's in another building, rebooted, managed to get two bars of wifi, still wouldn't send, moved even closer to the router manged to just get 3 bars and pow, the message sent right away!
Moved away back to my normal desk at work, signal dropped to 2/1 bars of wifi, however now, messages continue to send now.
Clearly when I'm at home I'm only ever a few feet away from my wifi router and always have solid 3 bars of signal, not the case at work.
However, this still only appears to be something that's been introduced at the iOS6 update as this was never an issues prior to this, but has been an issue right from day one after updating!