Over the last few weeks i've been having increasing problems with my wifi connection.

Works fine linking up to my wireless router at home and also the wifi connection in Corney & Barrow (London chain of wine bars) but I'm getting interminable grief from things like T-mobile. It's either not connectiong or doing so with limited connectivity (i.e useless).

Have tried repairing the connection but to no avail.

Any thoughts as to what the issue might be? It seems to have gone downhill since I was in Canada where I 1) plugged into the Fairmoint LAN in my room, 2) installed second life and 3) used some dodgy wifi connection in Whistler.

Thanks