Had exactly the same thing happen two weeks ago. 240V Kapex 120, only used in the workshop to cut miters ect. nothing heavy.
Started spluttering and a burning smell, i thought the brushes were gone.
I decided to take it to my supplier, who sold me it, as they have a good repair man. After looking at it, he said the motor was burnt out !! There was nothing wrong with the brushes, they were like new. So they arranged to send it back to Festool UK for warranty repair as its only just over 2 years old.
I had a phone call from the supplier yesterday with a cost for repair of £342.00. Festool said the saw was not registered for warranty. Talk about shocked !!
The saw was registered for warranty by my supplier there and then when i bought it, but it seems the paper work was mixed up with a UG stand, and it was the stand that was registered. So to cut a long story short, it has all been sorted out and will be repaired through the warranty which will run for the remaining year.
The fact that the saws motor has burnt out after 2 years is very worrying indeed, i had justified the cost of over £1000 with the fact that it is supposed to be vastly better than the rest. Seems i, and from what i have read here, others, are wrong in the assumption that "you get what you pay for"
Surely, with the price paid, the motor should last a lot longer than a couple of years ??
If the warranty mix up had not been sorted out for a repair, i think i would have been going down the route of Sale of goods act which says goods should last a reasonable amount of time !!
I am now contemplating selling it on when it is fixed.