We had a Dualit that lasted about 15 years. It had the usual problem of one side browner than the other but we liked it enough to but a four slice model when it finally packed in. The new model has been a problem almost from the offset. The timer kept sticking, it first just for a few 'ticks' then eventually it gave up the ghost (or rather set fire to the bread).
I replaced the timer yesterday but found that it was not the timer mechanism but most likely the casing. The old model had a different timer. The new one has a design fault. I'd guess the casing is so weak it is distorted fixing in place by the two retaining screws. The one I removed worked fine when free from load. The new one worked fine before fitting: neither work when fitted. I used a couple of washers to ensure the switch was not dragging on the toaster body - no luck.
A product is only as good as its components. Duality are using cheap and nasty switches - or they are not being manufactured to a high standard (what are the chances of my getting two bad ones?).