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The new one HRM-Dual doesn't show pulse via bluetooth

I just bought a new HRM-Dual and it's connects to iPhone 12 without problems. For the first 30 minutes everything worked fine, but now I can't see BPM in my wahoo app (or any other - I've tried 10 or more different). I've tried all recommended - new battery, soak belt in water, tighten the belt, change the position of a sensor on the body (left-right). I even measure belt resistance with a multimeter- nothing helps. What should I do?

  • HRM-Dual doesn't send data when I use iPhone 12 because when I tried my old Android phones (Samsung, HTC) everything was ok

  • I have same problem with Samsung S20 FE. On my old Sony Xperia Z5 works fine (BPM and battery level are transmitted to the mobile). But on Samsung S20 FE I'm only able to connect device but then doesn't work. I tried it in different application Locus, Strava, MyAge but it doesn't work. No BPM are trasmitted.