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FR265s doesn't record sleep data

Two days ago I replaced my battery draining FR245 with a FR265s. Everything works fine so far but now it was the second night without sleep data. HR worked fine during the night. Sleep mode and DND is active from 00:00 to 08:00. No energy saver. Most time I go to bed later and wake up later but at least for my FR245 it didn't matter. What's wrong with my watch?

  • Is the new watch set as your Primary Wearable Device?

  • Yes, it is set as primary device. The FR245 is already swtched of. The night before it was still on but for the last night I switched it of. No luck.

  • Is the sleep data visible directly on the watch, when you enter the Sleep widget?

  • No, there is no sleep data, no HRV data. HR data is fine. Meanwhile I did a restart (long press light button), so I'll see next night.

    I'm also wondering why the altimeter is messed up. After installation it showed -141m... Bremen is 11m... Did a calibration with GPS, 11m. Auto Calibration is activated. After my run over several bridges with elevation I had no changes in altitude and no stairs. Went upstairs in the house two times. Okay, at least 3 stairs (instead of 4). After the restart an hour ago the altimeter shows 55m... I'll see what happens after my afternoon walk.

  • Still no luck after restart of the watch. No sleep data, no HRV. No I did a factory reset. That one where CIQ stuff and activities are kept. I'll see next night.

  • The factory reset solved the problem. In the morning the watch showed sleep data and HRV data.