Hello,
As a method to minimize the possibility of label peel-off and/or adhesive migration to the drums/chanrge roller, please try printing labels from tray 2 instead of tray 1. The bend angle induced by the tray 1 feeding can cause the labels to more easily peel off. It will make sense when you load the labels face up in the tray 2 versus face down in tray 1 and follow the paper path fom each input.
Please let me know if this helps.
Thanks,
Dave
I work for HP.