Issues with internal heart rate sensor in FR235

Hi Guys,

After the firmware 4.2 release users started to complain that their fr 235 where not showing heart rate data in my app (Gym Timer)

I got a 235 last week and after some tests I noticed that sometimes it takes up to 30-40 seconds for the watch to display heart rate info, sometimes it's instantaneous.
Initially I thought the complaining users were just too anxious, and where not waiting for the watch to aquire a steady hr reading.

But this morning I experienced what my users are complaining about, I started my app (Workout Genius) and waited for 5 minutes and no heart rate data showed up.
I verified the back of the unit and the sensor was enabled.

I quit my app (Workout Genius) and opened the native heart rate history widget and It was showing my hr data correctly.

I openned my other app (Gym timer) and got no reading for hr data.

I powered the watch off an on and that solved the problem.

I am not sure if this info is relevant but It was not carring my mobile this morning, so there was no bt connection.

During the last week I started my app a hundred times for testing purposes and never had an issue, but I was always near my mobile.

Anyone else experiencing the same problem?