On a whim I looked on a well-known on-line retail site - named after a South American river where the one breasted warrior women used to live - in Brasil
They offer dualit timers would you believe?
Good Luck...
September 2015
Is it possible the popup is what switches the toaster off? I wonder.
I doubt spares ar available so, unless you are competent to climbinside, just get a new cheap toaster.
XX
September 2015
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix toasters.