The reason, why somebody retire from job/ resignation by their initiative, and non dropped their job by their company, or riffed by company/ termination, in the reality its answer progressively trapeze to situation & condition in company, not because of big minimize the compensation accepted, but rather to security, guarantee, and working convenience which less.
Company have ought to introspect, why a lot of employees resigned. I think company have to attention to employees require to be given, attention do not always in the form of items, like for example authority & clear responsibility, clear goals, there is standard of clear operation procedure, medium work the adequate, and appreciation for their good performance, contribution, idea, ..etc.
If all that attention have there no or nothing, hence omit to await the just time, one by one employees will go out, then will be changed by new employees, that way further so that rotation [ turn over] high employees, and condition like this is not nicely for the company, employees always change by the newly one, company need time again for the adjustment, orient, and training, later or then during not too long old employees go out and changed by the newly again, this make company will not expand, and will road in place.