Skipped stitches


ladybug35186
 

I have been trying to make a phone bag using cork and a fabric lining.  When  I am sewing on cotton fabric, my Janome Horizon stitches beautifully but when I add layers of cork and fabric,  the machine may skip one or several stitches.  I have changed needles and thread and speed.  Any suggestions will be welcome.  Thanks!

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