WIFI- extender + Password problem

Hi ,thanks or the posting ,will save the link for future referance.

Managed to get up and running with the extender today , my pal is more pc literate than i so he had a look at it .

The problem seemed to be that as my ipad was already linked to my router and was working ok ( this was before i bought the extender) , then when i then tried to connect it to the extender without deleting the orignal network link , it was ok for a  few weeks as it accepted the password,etc, but for whatever tech reason it seems to have "lost its memory" as regards to my password on the _EXT link.

What he did was to  click " forget this network" on the direct link to my router ,then he re-joined using the _NET link ,it accepted the password and bingo it worked ok.

So it seems my router eventually did not like having both network links to the same router , as even when it was connecting ok it would at odd times change network links on its own accord ,i.e switch from TALKTALK ABCD9WB   to TALKTALK  ABCD9WB_EXT ( hope this makes sense).

By the way can I connect more than 1 device thru the EXTENDER link please ?

Thanks,Rob.