After further troubleshooting today, and with outstanding support from SiteGround, I have found the root cause. Turns out that every time termly_account_update wp-cron action ran (scheduled every 24 hours), it would crash the wp-cron processes, causing all other due now wp-cron actions to fail, including my my_heartbeat action.
termly_account_update is a wp-cron job associated with the Termly Plugin, a GDPR compliance plugin.
Uninstalling the plugin resolved the problem.
I have reported the bug to the Termly developers.
David.
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