I purchased a new BEKY-S1506CII in January of 2021. I have not run much at all on it until just recently, and I am now having trimming problems with the new MK8 system. It is happening mostly on one particular head and another is starting to follow suit. I have cleaned the hook, knives and surrounding assembly and even checked alignment. Have you had any luck resolving your issue? I am at the point of getting a Barudan technician involved.