Too bad I do not get out a stable function

To find a good rhythm leg jogging, I bought this belt. The corresponding app I used earlier, get along well with them.
At first I found it difficult to connect the belt with my Samsung Galaxy S3, after some fumbling and multiple battery change, we went reasonably. But not very stable, always the line went dead, or even did not take place only. Unfortunately, partly repeatedly restarting the app and the mobile phone or turn on / off Bluetooth part of the ritual before each run. Even if the belt is detected, often comes a message that he could not be recognized. What now?
After recommendation by the manufacturer and other users on the Internet, I then tried ECG gel - so it was felt a little better.
Until a few weeks the whole was worse again. So again changed the battery, reboot etc.
Now I use the belt good 6 months, and had roughly estimated at about 20% of cases at first a stable connection. Once again today, the half-way point was recorded anything, I will now probably separate me from the part.
The price for me a disappointing result.