Agree with the last post. SMD connectors just cannot sustain the force during a hit, especially in the corners like your pcb design. You can see that the nylon boardlock pegs used to secure this edge connector have broken off.
Highly recommend THT but aside from this suggestion, share more details of this part number and also the other JST connectors to the right side in your pic.
Which part numbers were used to the right side ?
Will share more details (when at the office in a few hours) of a mfr we have used in Asia that can customize the JST connectors to suit. They are dirt cheap but MOQ will apply. We customized a similar connector that JST does not mfr. It was a THT connector with body of 18 pins but stuffed with only what we requested for the male pins. This allowed us to build a galvanic isolation between interface ports due to the missing metal male pins.
Perhaps they can customize the smd version to allow for a single SMD connector to be stuffed for the entire horizontal plane.
Then the entire blade of a single nylon connector body will assist to absorb the forces.
Just a suggestion.
Update:
1) can the PCB layout be modified for future PCBAs ?
2) We have used with very positive results, LHE out of Asia:
https://www.lhecn.com/blogs/what-is-smd-connectors/Note the extra SMD PCB pads to improve the strength of the mounting of this connector.
Here is our last sales contact:
Ms.Amy
Sales Assistant
Zhejiang Lianhe Electronics Co., Ltd.
Tel:86-577-62383212
Fax:86-0577-62382566
Email:lhecn@lhecn.net
Trade Manager:lhecn@lhecn.net
Skype:lhecn-littlebear
Address: No 8 Innovation Road, Gangwan area, Nanyue Town Yueqing Zhejiang.China 325609
Website:http://www.lhecn.com/ http://www.lhecn.com.cn/
Contact Amy to ask for their advice on the issue. Do keep the soldering temp down but do believe you need to reduce the force this 2 pin connector is facing during transit (more bubble wrap?) and/or insertion of the mating cables. This vendor can customize the JST style connectors to suit.