In many cases those jacks, switches and pots mounted to PCB just cause tension to or break the solder connections when they are tightened to the front panel, especially if there is no other mechanical support except those electrical connections. They should be, if possible, soldered to PCB after tightening the front panel nuts first. I just today had to repair a Pioneer hifi amp which had ripped the soldering of PCB mounted treble pot because the tension left to the pot connections after installing the PCB into the front panel and tightening the shaft nut.
In many cases those jacks, switches and pots mounted to PCB just cause tension to or break the solder connections when they are tightened to the front panel, especially if there is no other mechanical support except those electrical connections. They should be, if possible, soldered to PCB after tightening the front panel nuts first. I just today had to repair a Pioneer hifi amp which had ripped the soldering of PCB mounted treble pot because the tension left to the pot connections after installing the PCB into the front panel and tightening the shaft nut.