I did today and they suggested it may be the HR strap 
Not sure why they thought that. In any case you might want to be more assertive and politely but firmly insist on resolution.
I agreed to give it a test without the HR connected and if it still happened they’d replace it.
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Personally that is unacceptable suggestion and not a reasonable workaround. Which HR monitor?
Wahoo Tickr
I sometimes use a 4 or 5 year old TickrX with my 530. No issues.
If it was me, I’d reset the Tickr by turning the battery around. I’ve got a voltmeter so would check if battery needed to be replaced. Then put battery back in and see if it happens again.
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