My wifi keeps disconnecting my PC since a sky engineer visit

[Snoringmountain]

I had an engineer out to look at my wifi as we have a lit of areas with bad ir ni signal. Sincevthe visit this afternoon my PC and phone both keeps disconnecting When I try to reconnect the pc I get the error Some information changed since last time you connected. We need additional information to complete the connection, and have to put in the password again, I haven't been connected for more than 10 minutes since, and have restarted the hub and the devices

[Snoringmountain]