Difficult starting hot engine - Fabia 1.4 8v

Hi Everyone! Cold starting is no problem, but when engine is hot it struggles. The coolant sensor has been replaced twice, but hasn't improved it. It seems a common problem, and I wondered if cleaning the throttle body would do any good? I've never done this before, and would be grateful for any advice on using throttle or carb cleaners. The engine tuning was checked last service by a VW garage, and they thought everything was OK... so do I just accept that this is how my Fabia is supposed to be??? I do like the car, but this does niggle me!

Would be very grateful for your advise and comments. Thanks!