Hi, I have a strange HR measurement issue with my Suunto 9 Peak Pro. I use latest FW version 2.50.28 During continuous cycling, the optical heart rate measurement works perfectly fine. However, after I stop for a short break (around 2–3 minutes), the HR reading becomes completely inaccurate when I start cycling again. For example: Before the stop: watch shows 130–150 bpm, which matches my chest strap. I stop for 2–3 minutes. After I start cycling again: the watch may show 50–80 bpm, even though my actual HR is still around 130–150 bpm. The incorrect reading can continue for many many kilometres. I have confirmed this using a chest strap, so it is definitely not my actual heart rate. Interestingly, the green optical sensor LEDs remain active, so the sensor does not appear to be completely switched off. It happens when I recording activity as cycling as well as I am not recording an activity during these rides, simply use the HR display on the watch face. Has anyone experienced the same issue? Is there a known problem with the OHR sensor/firmware after a period of inactivity or standing still?

@Squirrel completly forgot about that one, indeed

@duffman19 So I tried first with a short stretching activity. Delete from SA, log out of SA, login again, resync and it showed the activity again. However. doing so with my long run, seems to not resync although it’s still on the watch (at least showing on the watch. I noticed. Daily HR, steps, resources are all in SA including the activity time. But GPS and activity stats are not. Would be great to ad Fit/json manualy Back into SA. That’s possible? Is it possible json and fit files are deleted if you uninstal SA?? Would be an explanation I can’t find them on my phone anymore.

@Elipsus No problem. Soft and factory reset did not fix the issue. I will charge the watch up to 100%.

To add to this one, I have the lovely death of HR experience today. See below: [image: 1786859596217-screenshot_20260816-074727.png] [image: 1786859596253-screenshot_20260816-074744.png] I sent logs of course, latest firmware. But somewhat perturbed that this is the end firmware for the watch and this happens. Resources is also stuck at 70%, despite being at 10% before the night. So I suspect a reboot or something is involved?

During last 6 months my S9PP stopped HR moritoring / sleep tracking, so this is somehow related to last sw update as noticed already. Earlier this happened only once a month and always in the middle of the month, 17th-19th of the month. Now in August this was getting worst, 2 times in the beginning of the month and now again on last night (14.8)

@Łukasz-Szmigiel ok @isazi for the follow up just in case

@paul28 I recently started using the suunto+ stryd app on my race s and was puzzled why I sometimes see groundcontacttime and other metrics beside power and sometimes only power. Now I know. I also have the problem that my heartrate sensor looses connection with my watch and doesn’t reconnect. That’s going on for over half a year and no solution in sight. There might be a next firmware update which might arrive in august but that will not contain a fix. And a firmware after that? I really doubt it. I will report this to suunto support to keep the pressure on.

@duffman19 I have just got a Suunto 9 Peak Pro and confused by the contrary mode, I’ve just suggested to Support they have a simple light/dark mode option which would work for everyone. I did a downgrade to original firmware as a test and did like the old colour options on light background a lot

Thank you very much for answers! Didn’t know that. I’ll prepare more blocks for solve problem of repetitions.

@Tami999 I guess it’s the effect of sunlight, or maybe that plus seawater ‍️ you can have it once I replace it

More than two years after the latest post (which wasn’t answered) I just had the same issue. Bought the S9PP end of last years as it was in sale and I thought meanwhile all SW Bugs should have been fixed. Send logs to Suunto. How to rely in that watch for things like Everesting? During the last three months three soft-resets were necessary. My son bought it about four weeks ago and in last week he deserted it four times. As said a few posts above: this is annoying

@mdavis121212 said in Using Suunto Progress: @Brad_Olwin Well I wanted to do Mt Rainer but that’s not going to happen at my age. lol. I want to go faster at Century rides. Why Not!!! I have skied Rainier but many, many years ago. I am nearly as old as you, 69. I have a 100 mile race with 23,000 feet vertical gain in June. I am not letting my age dictate what I can do. I would develop a good training plan for riding or get a coach if you need to. There is no reason you cannot build your fitness. So some good goals.