Pixma MG3650S - Vertical lines not quite straight

Nov 6, 2020
I have an MG 3650s canon printer and it has started to print vertical lines that are sort of zig-zag. I have done both the automatic ( no change) and manual head alignment ( a little better but not perfect yet) . The slight offset of print is enough for the Post Office to fail to read the QR/Bar Codes it prints out.
Do I need to keep doing a manual alignment until all is ok or is there something else to try ?
The attachment shows the lines, the top is after manual realignment.
Thanks. Scan.jpeg

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