[Q] WiFi wont reconnect after unlock

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Hey

I've seen similar threads based on android handsets however this is a WP7 based HTC 7 Trophy.

I will be using WiFi fine for a few days without any issues of it connecting when it should (when it awakes from lock) however every now and then my WiFi will just stop reconnecting and then fail to connect from then on.

I've tried:
Deleting and re-adding the network / password
Power Cycle the Phone
Power Cycle the Modem/Router

the only solution that worked ONCE was that I re-made the network on the router itself and reconfigured all my computers and mobiles in the house to use the new network however this is a pain and didn't solve the problem this time.

Thanks in advance.

UPDATE #1: Creating a second wireless network on my router works fine, seems this has something to do with that specific network :/