@isazi I only have a recent (as in today) reaction from Suunto stating they haven’t got a clue what causes the problem, let alone how to fix it. But please do report it, with logs, when it happens again. That would be very helpful.

@Ars-Vitae Any update? Did the warranty replacement or repair actually fix the issue? I’m having the exact same problem with my Suunto Race S.

@lydum, known and fixed in next firmware.

You’re not alone https://forum.suunto.com/post/193526

Same here with the 9PP after the last firmware update. Since then it happens regularly and as it isn’t reliable anymore I stopped using it regularly. Anyone tried to go back to another earlier FW?

Still nothing done about this, huh.

@iron-morris I use a Karoo 2 and looking at yesterday’s ride only the calories are shown as 0. But of course the watch specific things are not shown at all like feeling, PTE, EPOC.

@2b2bff You’re not alone, happens to me too once or twice a month. Why oh why can’t they implement the ability to edit and delete sleeps and naps.

I have the same issue. Race S, Wahoo HR ticker + 3rd party strap. It often takes ~5 mins from start of activity for HR reading to become accurate (e.g. 150bpm Vs 40-60 BPM shown). The HR strap is definitely connected before I start recording the activity and displays the accurate HR reading until I hit record, which is when it often goes funny. This is pretty frustrating as it makes pacing more difficult and messes up the stats for my runs, so it’s difficult to see any HR trends I may have. I don’t believe it’s a strap or sensor issue as I never have issues with them while using my Wahoo Roam bike computer or any indoor cycling training software. The watch also displays an accurate HR from the strap when not recording an activity, so seems like the issue lies with the watch (particular model or my specific watch perhaps…). Any thoughts? If this continues I’d be tempted to put in a warranty claim, which is a shame because everything else about the watch is fantastic.

Questa è un’attività in montagna di giugno 2025. Un anno fa[image: 1781120433280-1000077770.png] Perfetto… Credo sia un problema di firmware o algoritmo

@Squirrel - thanks for the tip. I rebooted watch and iPhone a couple of times, and the watch faces now show on the store when they didn’t before. Back in business. Phew!

@Egika no, you totally understood my question, and I was hoping the answer would be what you said… Thanks!

@maszop sometimes you realise at the moment to download maps and … Yeah, otherwise this is just a discussion.

@withManish On iOS there is rungap for datamigration. And I use strava and intervals.icu. It collects data from multiple sources (I had different brands in the past). But most importantly, data of 5 or 10 years ago hardly has any relevance. But I’m no hardcore data collector.

@Squirrel thanks!

@sky-runner it does actually. It always starts to connect to the last used, but advances to others it finds. But you can disable each sensor per activity and it will remember this…

@aiv4r Thank you! I’m now looking for AirBnB accommodation for the UTA 22 next year I love this watch but I’m kicking myself for not trying on the Race 2 and the updated bands at the Suunto stand…

after everything you already tested, this really does sound more like a firmware issue on the Suunto Race S after 2.39.20 than a router/network problem. The interesting part is your router logs showing absolutely no connection attempt from the watch. That usually means the WiFi module itself is not initializing correctly after the update, not just failing authentication. I d still try one last simple test: connect it to a very basic 2.4 GHz network without mesh/repeator features, WPA3, band steering, or hidden SSID. Some devices become weirdly picky after updates. But since you already tested multiple routers and hotspots, I honestly doubt your network is the real issue here. Feels like the update broke WiFi handling for some units, especially since the problem started right after the firmware upgrade and before the maps could finish downloading.

@Kajkom Yes, it matches. But that doesn’t seem like it’s connected to the issue. The watch counts correctly all the way up until you save/finish the workout, at which point it discounts it 3.75%.