Z wobble? Wave

Looking to get some thoughts on what might cause this ive had it on some prints and not others its not belt slipping to cause a layer shift but the whole print seems to wave on a very gradual pace and it returns to where it should be as it goes up. Just had a horrible print come out very wonky and 100% time to fix it now. Im taking the lead screws out to see how much those are bent if any, although it doesnt seem to match with the pitch so slightly confused.
Let me know if anyone has some ideas would be greatly appreciated!
It is in both directions, the nuts on the screws seem good along with the couplers..

Also its a vcore 3.1 enclosed 400mm
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