This started after moving the treadmill from our garage and into the basement.
Try replacement of the mains power cable.
They are a weak link as they were supplied with very poor quality cables from new and they draw a lot of current over time they fail to provide the max power and this causes running issues.
Only test other components after replacement of this £5 $6 item
If you wish to get some details; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/
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