Custom PCB soldering issues

Hi, 

I am working on a custom PCB. I ordered them at JLCPCB and I have some issues with the soldering. I noticed in a few boards there is a short in the board between the NRF VDD line and GND. Using a thermal camera I found out there are multiple boards with multiple components getting hot when injecting power with limited current.

I set the power supply to 3,8V and current to max 80 mA. All shorts are gone when i removed the NRF9160 from the board by using a pre heater and hot air. 

 I also added the Gerber file. Is there anything I can do to improve solderability to this design? 

nRF_Board_gerber.zip

Thanks!

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