Hi guys! Thank you all for the responses. Everything was solved! Incredible what was happening:
Interested in a follow-up on this as I am having the same issues.
1. After reading hallyconn was having the same issue I sent a message to Support. They answered about how to downgrade and also about considering that maybe the cables were not capable enough for the new updates (which is quite strange to me, since Kemper uses just a USB type B 2.0, and then I send it to a USB 3 in my computer).
2. Due to that advise, I tried swapping the cables between my interface and the Kemper, since both use the type B connector. To my SURPRISE, the thing CHANGED but NOT solved: Suddenly the freezing was not hapening anymore, but the Kemper took about 5-10 seconds to change the patches (in my local library).
3. After realizing that cables matter more than I believed, I ordered a classic Amazon UGREEN USB Type B 2.0 golden style which costs about 10 €. This cable DID NOT solve anything, in fact, it behaved with the very same total freezing stuff....
4. The stupid solution takes place now....
I CONNECTED THE KEMPER TO A 2.0 USB IN MY PC.... AND THAT WAS ENOUGH!
So, if you guys are connecting your Kemper to a USB 3.0 just remember that Kemper does not use 3.0 protocol, and MAYBE you can take the best results by connecting it to a USB 2.X port.
I hope this is helpful to you!!
Metalhawk.