WiFi Connection Problems

[davea66]

Hi
I have seen many posts over the last few months about this issue, but none with any suggestions that have resolved my issue!
I think this goes back to the RIM ouitage in the summer.
Anyway for MONTHS now, I have been unable to get a WiFi connection on my home AP.
The one in the office works fine, always has.
The one at home *seems* to connect - I get the WiFi SSID appear at the top of the screen, but the WiFi logo is greyed out.
Sometimes, the WiFi logo will light up, but I do not actually get any data transfer. It struggles to do any transfer for a while, then the WiFi logo greys out and it reverts back to the mobile network.
I have tried all the suggestions I have come across - battery pull, reboot AP and router, resent service books etc.
I have even wiped my handheld and started again, defaulted my AP and programmed again from scratch. I havent yet resoreted to a baseball bat, but I am very close.

I have just purchased a new AP out of desperation, even though every other device I own - laptops, iPad, iPod etc. - connects instantly and without any problems.
Guess what - same issue, except I am 80 quid lighter.
Can anybody please please please help me sort this one out?

I am on O2, business account, 8520, six other handsets on account report no issues (however does not necessarily mean they are OK).

Many thanks in advance.