My Suunto Vyper air has been reliable so far in that once its paired up it stays paired for the entire dive.
It does however change transmitter codes if the transmitter is activated for long periods and doesnt pair with the wrist unit. The typical scenario where this can occur is after a days diving washing my gear. I rig the regs to my cylinder and soak them, this activates the transmitter, but the wrist unit is packed away. If left soaking for a few hours it usually changes codes
If this occurs it will not pair for the next dive unless I reset the code. Its easy to do so it doesnt bother me that much but would prefer if it didnt do this.
I do have an SPG also.
It does however change transmitter codes if the transmitter is activated for long periods and doesnt pair with the wrist unit. The typical scenario where this can occur is after a days diving washing my gear. I rig the regs to my cylinder and soak them, this activates the transmitter, but the wrist unit is packed away. If left soaking for a few hours it usually changes codes
If this occurs it will not pair for the next dive unless I reset the code. Its easy to do so it doesnt bother me that much but would prefer if it didnt do this.
I do have an SPG also.