2015 Mazda5 Tailgate Won't Open - Fixes?

:
I have 12 Proteges :)
2015 Mazda5
Tailgate would no longer open, first intermittently, then permanent no-op.
Could be opened with emergency mechanical lever release from inside.
Replaced both the actuator and the exterior switch with brand new OEM parts.
Lock Actuator C513-62-310A
Release Switch C513-62-4B0
Locking/unlocking/opening all worked ok after.
Until one month later, back to square one, no longer opens, except with emergency lever from inside.

Possibilities:
- Either the new switch or new actuator has failed prematurely - would need to troubleshoot.
- Issue in the rear hatch harness. C513-67-060, Harness no.2, rear. Electronics, front, harnesses, wiring.

Any other ideas for what could be causing this?

Thanks in advance.
 

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