You mean a grand total of 2?
I know every single problem sucks, especially if it's a 80$ UltiController that is not working properly. But I can personally guarantee you that every UltiController is checked if it works (LCD, Button and beeper) before it's shipped. Seeing the shipping numbers (that I cannot disclose) then we would be flooded with support email if there was really a major production problem.
Our current electronics producer is sub-standard, and we are working to change that. But changing this is not as easy as it sounds. Having electronics produced is not the same as baking a bread. The previous company I worked at made the stupid mistake of saying one day "Well, from now on, all electronics need to be produced at company X". Hilarity ensured and tons (100k) of money where lost due to lost in sales, extra support and lack of stock.
Most of the electronic problems (I've checked out a few of the "bad" boards we have here) seem to be down to bad soldering. This can be on the UltiController side but also on the UltimakerPCB side. It kinda sucks if you need to check it, but it's not "unfixable"