It looks like the door is sensing some kind or resistance. Sometimes during warmer months, our door will emit a couple of beeps while it attempts to open, then closes.
It seems like two possible conditions cause this reluctance to open:
1. The door gaskets are soft and sticky. I applied seal lubricant or ArmorAll to the seals and this seems to help.
2. Something is interfering with the door. The net that came with our RX will sometimes slide under the door and jam it.
You might want to check for similar causes.