I have an XPS L502x laptop with an Intel Centrino Advanced-N 6230 wireless card with the latest driver 188.8.131.52. For the past couple of weeks the strength of the signal as measured by the Intel proset tools goes from excellent to poor in the space of 60 seconds, back and forth. It seems to do this on all channels from 1 to 13. It definitely is affecting Internet performance. I have the security set at WPA-Personal in an attempt to try and stabilise the network. I have also been using iSSIDer to try and find the best channel since there are about 10 other wireless networks from other houses around me. I have a D-Link 645 router which is admittedly about 10 metres and 2 or 3 walls away. However, until a fortnight ago, the network was dead stable showing a strong signal (4 or 5 bars (-50). Now it is all over the place. Could it be a damaged card?