Solved Unexplained movement of Z during printing

Hello, I have a new problem with my R1+. I did a print in spiral mode for the first time, and then went back to a regular printing. That is when this problem showed up. The printer lays down the skirt and the stops, moves in Z+ for about 95mm or so then down to resume the print, but after a pass or two it then does the move up in Z again, back down and some more printing. If it is doing the layer fill it chugs right along. Holes, its up, down-up, down as it makes the hole. Some time the perimeter run is also interrupted.

Reinstalled the firmware from Robo, reinstalled MatterControl, but no joy. Have checked and rechecked all my settings, all looks right. Any ideas what the next step should be? Thank you for any ideas you can pass my way.
EDIT: Thank you for taking a look at this. Solved: old eyes