i have the latest firmware beta on it and since then i only have the error 0500-4003 165221.
i had a malfunction during printing where it was driving very slowly on the right side and very fast. it was also very loud.
i first thought my sd card was defective, replaced it and then it was exactly the same with another one.
Downgraded to 01.08.05.00 again. and now it prints