@Frank_Official thanks for your answer, but I just stopped my monthly subscription after trying to cope with the taste for a week.
I currently have 3 different batch numbers of Jake Original, 2 at home and 1 at work. All three are slightly different.
The oldest of them is okay (About 5 meals or so left), maybe a bit worse than the very first batches I received but fine (See the thread opener, the following is about the newest delivery from this month). The newest batch I have is a bit worse (also a bit more red in color) but also still okay (19 left, I only tried it to see if there's a difference). The one in the middle though, batch number 0026 is terrible, the color is definitely more red than from other batches and the taste is off too. I had about 8 meals of those now (Sadly 32 left.. I haven't opened one of the boxes at home yet, so no clue which batch is in there) and there's definitely a difference, I more or less have to force it down if I want to eat it..
I also talk about the shake being more red (After thoroughly shaking!) and not the actual powder. It looks different and it tastes different and I can tell, I'm drinking Jake 2-3 times a day and have been doing so for months.
I'm sorry, but such a quality difference is just not acceptable, especially when one box costs me 50€ and I'm currently sitting on at least 2 boxes of that batch (Still have to check the batch number of one unopened box at home). It's a bummer too, I quite liked Jake when I started out with it and I still like the taste of the older batch (Even though that one was already slightly off).