The struggles at Boeing continue as the company plans to lay off more than 400 aerospace labor union members — just weeks after ending a massive strike involving a separate union.

Layoff notices went out last week to members of the Society of Professional Engineering Employees in Aerospace, according to the Associated Press. Boeing had announced the end of a seven-week strike by its machinists’ union just two weeks ago, as the troubled manufacturer lurches from one issue to the next.