+1
Its clearly not a contact problem, the circuitry appears to be detecting a resistance from the coil or at least the presence of an atty. You could try putting the base of an atomiser without a coil installed and see if you get the same result. That way you can eliminate if it is the board that is playing up or if there is an internal short/break caused by pressure on the 510 connector.
As a last resort, you could try a cotton bud lightly dampened (not soaked) with isopropyl alcohol and clean/dry the 510 and threads in case there is any manufacturing gunk preventing a decent connection. Other than that, it sound like a return job

.