My parnter has an ibm thinkpad with a dynamode wireless network card which she uses to connect to a d-link router (which i am hardwired into)

from time to time she gets bumped off the network but it usally comes back on within a minute or 2... today she got bumped off and when she tries to manually reconnect it wont and says limited or no connectivity but also says that the signal strength is excellent

what could be causing this to happen, she has added no new hard or software but it just wont connect and its very frustrating

Thanks in advance