Soldered wires don't last very long on PCB
I do costuming-related electronics, and I have found that using hot glue to hold wires in place significantly reduces odd problems that otherwise occur due to wires moving around and damaging solder joints or breaking.

I suggest applying a dab of glue from a hot glue gun soon after soldering the wires in place. The blob of hot glue should be large enough that it can adhere to the wire's insulation, and should also attach to stable, nonmoving parts of the board, thus making the wire held in place by not just its metal parts, but also by its insulation, and eliminating extraneous wire movement that would otherwise lever against the metal join point of the wire to the board and hence weaken it by metal fatigue.