I have this problem with the Suunto HR belt since November 2025… I reported this several times here, and I contacted the support… they told me to send logs… it’s a problem with SV1… it’s a problem with SV2… with two different HR belts… and that’s why I don’t think that this is a problem of a belt or a watch… this is a Suunto problem, but it seems that they don’t care about this…

@sky-runner you might be on something here. I too was starting activity with wrong S+ (due to the fact it resets everytime you do a guide) and had a crash. now that I leave only one s+ (2 including the guide) I haven’t had restart. There were a couple of times though that my watch crashed without going to the menu but I always had on route navigation!

@2b2bff Sure…if you’re doing an interval workout I agree completely. But during a run without any “targets” it still happens. Haven’t found a reason (or how to make it stop) yet.

@Gilles-D. said: how to revert to previous FW with watch V1? Settings > General > About scroll all the way down to the end hold Down button to enter Debug menu Select OTA pkg

@Matúš I just thought that perhaps the intermittent contact with the skin could cause the sensor to go haywire, causing the monitoring to block… but I’m not sure that’s a valid hypothesis…

@Nic-Cooper-Lewis had the same Garmin chest strap. Didn’t work with suunto Run so I sold it. Bought Suunto Chest Strap and it’s faulty…for me the OHR is very accurate.

I notice that the colour gauge works in the simulator, and used to work on-device, but right now does not display at all on-device. I have only seen this with store builds, so will debug this when is not displayed at the moment, so will debug this when I get the chance.

Any updates on improved accuracy atm?

Please Suunto give some love to this app …

@pavel.samokha Hello, is there any news on this issue? It’s been almost a year now.

@Arnaud-STRAUCH Hello Arnaud Like you, I am very much looking forward to the CCR mode! If inserting a POI while diving would be a plus, I think the problem would come from the reliability of its geographical position since underwater navigation information is essentially inertial and comes from the compass! In my club, we face the same problem and apart from noting bearings and distances or using a SMB to mark the location, I don’t really see any cheap solution. Laurent (Pau Océan)

@soryp I confirm I did it twice following your instructions… That’s why it is so strange !