Peter, definitely not normal. Is there any chance your internet dropped out while you were cooking? Otherwise I'd chat to your consultant and or Thermomix. I have a 6 and love it dearly I also have a 31 and a 5.
We are mainly people who cook on here. I hope you've had a look at some our delicious recipes. When I bought my 31 many, many years ago I learnt to do so much more using this forum.
Welcome by the way. Let us know how you get on.