Thanks very much Chris ...I will change this. It never crossed my mind a change was available as an option, so I never looked into it.
I personally would never think of changing this link timer myself.....
On a similar note ... Given I bought this used, i noticed lots of settings seem to have been changed by the previous owner. which is understandable, maybe including this function.
I did a basic factory restore, when I bought it, but might look at doing a more in depth re-set, just in case there are other functions adrift.
I remember Yamaha technical support talking me through a 'total master reset' over the phone some time ago with another keyboard ( as it was not in the manual ) I will maybe contact them.
Again, thanks for your kind response - Keith