Co inciding with the firmware update to my Bravia KDL32WE613 I can no longer get the tv to connect to my wireless router.

To begin with my router stopped appearing on the network list, so I tried entering it manually. The TV then failed to find or connect with it. After restoring factory settings etc it does now at least find it and its in the network list, showing  a very strong signal, but it still continues to fail to connect. 

The TV  was purchased  for my young disabled daughter to watch  NetFlix, Prime and YouTube its very difficult in our household without it. Ive followed the various different advice I found in forums for not dissimilar problems  but this hasnt helped.  My BT5 router is fine and all ther IT in the house has no problems connecting to it. 

Any new ideas please? the TV is only 7 months old!