Time in Zones Does Not Add Up To 100%

Do you have any time with HR below 78 bpm?

Is the time adding up to the total of your workout? 25 minutes 51 seconds

Glenn_M_Eades said:

That leaves 47% of my run unaccounted for, and no way to know what zone(s) it was run in.

I wouldn't say "no way", you can easily lookup the heart rate graph.

e7andy said:

Do you have any time with HR below 78 bpm?

Is the time adding up to the total of your workout? 25 minutes 51 seconds

OP's HR being in zone 0 (i.e. the zone below zone 1) for a significant amount of time does seem like the most plausible explanation at first glance, except they also have 0% time in zone 1. Hard to imagine they could go directly from zone 2 to zone 0 (or vice versa), skipping zone 1 completely, even if they paused their activity while their HR was changing significantly - they would have to be very lucky (or unlucky) to happen to exclude all the HR readings between zone 0 and zone 2.

It's also kind of implausible that anyone could run in zone 0 for half of a 50 minute run, unless their zones are set wrong. And in this specific case, it's hard to believe that anyone (regardless of age) could run at less than 78 bpm for 25 minutes.

 Glenn_M_Eades could you make your activity and share a link here so we can look at it?

It was a 47:35 run. That's why I stated it only recorded 53% of the run. 

Really? and you can see the shifts from one zone to another and what percentage of the time one is in those zones by looking at a graph? That's an amazing skill you have there, but unfortunately one that very few others possess.  

I'm assuming you were asking for a screenshot of my HR chart. Here ya go - 

HR Chart - https://imgur.com/a/dQg4QYh (Download for a larger view)

Glenn_M_Eades said:

I'm assuming you were asking for a screenshot of my HR chart.

What would be more interesting, is the link to the activity (open it in Garmin Connect Web  and post the URL address of the page), or even better, the FIT file (use the default export option on the activity page). It looks like the file may be corrupted for some reason.

Yes, it's clearly corruption.

When I got back from my run last night the 225 wasn't able to be recognized by Garmin Express at all. When I looked at it in Disk Manager it had lost its formatting and had converted to RAW format.

It's old enough, it's seen better days, and now that it's proven itself to have become unreliable I've just ordered up a Forerunner 255 Music. That should certainly solve the problem.