Glad I'm not the only one!  I'll ask about it when I ring customer service next week.

As the title suggests I made bolognese for dinner, as per normal, it has always worked before.  I noticed it was taking a loooong time to heat up to varoma temp, to really reduce the sauce, I kept having to add another 15mins to the cooking time.  So after about an hour it started to bubble.  Even when bubbling it didn't seem to have the same ferocity of bubble IYKWIM. 
I cooked it for another half and hour (at least) to try and reduce it.  It ended up being like soup, really thin, and when I poured it out there is a thick burnt layer on the bottom.  I'm going to try to have to attack it with some steel wool 

I have no idea what has caused this, my husband is livid and asking about refunds!  Anyone else had a similar problem??  I've only had the unit since November so will be ringing the service centre on Monday.

Thanks everyone!  I just iced my chocolate cake and it was delish.  I can't believe how quickly I've turned in to a thermomix groupie.  I'm looking forward to cooking in it tonight. 
I was telling my DH that it's not a very scary kitchen appliance, I read the EDC instructions once and feel like I've got the hang of things already.  Although it did take me 24 hours to figure out how to turn it on and off  (I was switching it off at the wall).