Z-Axis Frozen in certain spots

Hi all, I’m having problems with my Z-Axis. It seems to be frozen or locked up when I first turn it on. It’s almost like I need to warm it up in small increments (.01" & .1") up and down a little at a time before I can get it to move freely (1" increments). It’s kind of a catch-22 because I don’t trust it right now to use it but the longer I let it sit the worse it appears to be.

When I say froze or locked up I mean it - the gears aren’t moving and it makes a horrible noise too.

Appreciate any thoughts or suggestions.

Are the screws going into the delrin nut too tight?
Did you lubricate the acme screw?
Is the yellow DeWalt housing rubbing on the assembly?

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