Hi, welcome to the forum
many things could give the effects you describe,
from chuck pressure, jaw shape
to turret condition
even tool & tip seletion and overhang
If this is not occuring on OD as well as ID, then first look at the tool,
recheck speeds and feeds, DOC, tip and holder
We had an issue with a certain repeat job that ran OK, a bar from a different Co was used ( same specs, even used the same tip ), found the the bar was sh*t, replaced the bar and problem was solved.