It is obvious to me Klavis is just another low quality Eurorack company who cares little about the quality of their products.
I strongly disagree.
I have some Klavis modules in my system, they are all good and works as it should.
Very solid built, skiff friendly, they have clean good panel and ergonomic, and are priced well.
Caltrans: is my main tool for tonal stuff and to keep different Oscillators in tune, no problem since day 1, it works perfect.
Mixwitch: again, super clever, deep and useful module, never had any problem.
So, I think that you have been very unlucky...
I can understand the frustration when a piece of gear does not work as expected, but ranting on a Forum and bash a well reputable manufacturer won't solve your issues, nor change the perception of other happy customers.
Eric from Klavis is helpful and for sure cares about his products, have you tried to reach him via mail to explain your module's issue?