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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
This sounds like it is most likely a ground issue, they share a power source but not after each switch only before, check that the power is secure and same as the ground, it appears what is taking place is that there is enough contact for power on a single but not both and when both are operated the one is not getting a good power/ground path. This is however interesting that even when the one is not used the other will not work until you disconnect the one that does work, try swapping them side to side and see if you still have to disconnect on that side for the other to work or does the problem follow the actuator to the other side and then must disconnect that one still.
The other therory is that possibly the one is still moving faster and or the other is binding when that one operates which to find would require checking power and ground and no amperage loss to that side while the other is being operated as well, you will have to do a process of elimination to first check if it is or is not electrical related in order to eliminate that and move on to mechanical issues or with the actuator itself.
Thank you!- Joe
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