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Apparently two channels are colliding?

Dear Nordic,

Device: nRF51422. Protocol: ANT+. Softdevice: S210 v5.0.0

I have 3 devices: two masters (No. 1 and 2) and one slave (No. 3). In my application, I pair the slave to the two masters, store both channels IDs, and close all channels, until a button in slave is pressed. When masters are plugged, they have always channel opened and they are sending data.

When the button in slave is pressed, I quickly open both channels, send information (broadcast data type), receive a ACK (done by me by SW), and close both channels. This works fine most of the times, even if one of the masters (either 1 or 2) doesn't exist.

The problem is that, apparently randomly, when I try several times communication without one of these masters present, and then I connect them back again, sometimes, at some point information only arrives to one of the masters, and it even switches from one to the other. So if I press once, info may arrive only to master 1, and next time when I press again, info may arrive only to master 2.

The thing is that I do not know the exact cause of this problem. I am trying a lot of things but none of them seem to give any result.

Any idea on what it could be happening? Please feel free to ask more details.

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