Connecting, separately, to different Netgear WGXB102 Systems

I use my laptop in 2 separate locations - home and away. At home, I connect
to my network via my Netgear WGXB102 Powerline system into a BT HomeHub -
normally without difficulty (but see below). In addition, I use my laptop at
my local church where we also have a WGXB102 Powerline system into a Netgear
DG834N router; however, although the laptop eventually connects ok, it
constantly drops the connection (then reconnects again automatically). Non
of the other visiting laptops have the same connectivity problems - their
connections are always strong and stable. I have not encountered this
problem elsewhere.

When I use the laptop again at home, after using the laptop at church, it
takes 2-3 attempts to get a solid connection - once I do, it remains good,
and always connects automatically and quickly via the home WGXB102/BT
Homehub system.

I am running WinXP and also have Network Magic installed - tho' I use the
WinXP Wireless Manager to manage by connections.

Any 'steers' to cure the constantly dropping connection at my church network
would be gratefully received.

Tim