Our M&R tech did a machine check up a couple of month ago. He changed the servo setting to +4 at the END setting and as well close to +4 at the START setting. Last week we noticed that the pallets started to vibrate again a lot when the carousel moves into the up position. Today I did the servo adjustments, now we are at 0 at the END and -2 in the START settings. How do these significant changes in values happen over such a short period of time, is there anything I have to look out for to avoid this?