I don't know about that ... and not complaining - the ultimaker prints great. However, parts that are smaller than 2 inches still stick to my bed even with new tape. Not only that, I have to tear up the tape trying to remove the print as well as reapply new tape. So the problem still occurs with fresh tape. Both with or without alcohol. For 4 inch or more parts, it seems to stick, but I still need a bit more than usual force to get it off the bed (usually at the sacrifice of the newly taped bed). In some cases, the tape still stuck to the bottom and requires extra time to clean up.
Don't complain. This problem is not as bad as the opposite problem: part won't stick.
If you are printing parts smaller than 2 inches across you can reduce stickiness by using fresh blue tape and be careful *not* to clean it. My theory is that fresh blue tape has a small amount of the glue on the non-glue side. Or perhaps they coat the non stick side with some kind of wax to allow the tape to be peeled off the roll. Regardless, fresh blue tape doesn't hold the part as well and for a small part that is often okay.
To get the PLA to stick well to the tape you can clean the tape with isopropyl alcohol or just print lots of parts on the same spot of your blue tape.
So anyway, bed leveling is probably fine. You shouldn't complain. For larger parts, 4 inches across, you will need this sticking power to prevent warping/lifting.
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