Non veni pacem mittere, sed gladium.
Maintenance on ships at sea while at sea need to be carried out on warships (which are different than civilian cargo ships in so many ways). People need to chip paint and re-paint. People need to do all of those mundane tasks - which is why there are boatswains mates. The "new image" of a navy without adequate crew means that work won't get gone. Add to that a reduced number of ships and heavier pressure to be at sea nearly 80% of the time to accomplish the same mission load and the system will break. Which is what we're seeing.