Bluetooth trouper - signal dropping on 2nd trouper

I have 2 troupers paired via Bluetooth. Depending on the device I use for source, Asus, Xiaomi, Samsung phone, the signal is dropping on the 2nd trouper.

However, it works for some sources like iPad mini, Asus tablet, other phones

My observation, is the ones that work are old devices and probably old Bluetooth version.

I have also tried reversing the speakers. Meaning switching the main channel paired to source. It's always the right channel or 2nd trouper that drops.

Anyone else experiencing this?
Any solutions?

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