[otonet]

Forget about what I wrote, it stopped working again. See post below.

I had the same problem, i.e. some days ago the belt started loosing signal and then stopped working unless I was pushing really hard on the sensor or only worked for a few seconds after I re-moistened the sensors, thereby moving them to a new position. At first I thought it was the battery, so I replaced it with no luck: the belt still only worked intermittently, only for a few seconds, and displaying a too low heart rate.
As I saw this thread, I was willing to send the belt back for being repaired/changed.
However, I found the correct instructions to re-pair the HR belt after having replaced the battery in the FAQ of the suunto.com customer service (see "Question 19: How to pair the HR belt and Suunto t3/t4?")
In particular steps 5-9 worked, i.e. first select pair HR belt on the watch and only afterwards insert the new battery in the HR belt.
The HRM now appears to work perfectly again with the new battery (it has worked in the last 15 minutes without signal loss and the measured HR is consistent with manual count), while the old battery was indeed dead.

Indeed, the battery replacement process does not appear to be 100% foolproof. However, some malfunction users experience might be due to this, rather than to a broken belt. Therefore, should you run into this problem, it could be worth trying the above steps before sending it back for repair.

If it stops working (I hope not!) I will report again.
Cheers,
Oliver

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