I've been using Ultimaker about five years, Ultimaker 2 since 2014. The printers have given me a fairly easy ride I think though, as despite heavy use I only found the need to replace a part very recently. The failed part was the main board, and having installed the new main board from Ultimaker today, I powered up, and noticed a strange behaviour during bed levelling. Levelled the bed anyway, and attempted a first print with the new board. The video shows what happened :
https://www.youtube.com/watch?v=AU1R2G7aKgY
The issue shown here is more or less the same as happen