I've had my 530 since early release and it's been great until recent issues.
During my ride the 530 randomly reports 0MPH and pauses. This has happened while going 20+MPH, 8MPH and a variety of speeds all over the place.
My first attempt to solve it was to disable the hub-mounted speed sensor, and that has had no effect...problem still persist.
Next attempt to correct was the hard-reset the device, I did this and copied over some of the .fit files and this has also not corrected the problem.
I've validated that the auto-pause setting is at 3mph, and this all still happens well above that speed, mid-ride.
I no longer have the speed sensor paired, but the issue continues.
For reference, these are the current details of the 530 software
Software version 9.75
Auto pause set to 3mph
GPS Mode GPS + GLONASS