I've had a similar experience to that reported by Daniel S. and I wouldn't be surprised if it is because of the same mail carrier. To try to keep it short - my company has a couple properties in Vegas that they use to house visiting execs/trainers/etc. who come out here from our main office, and these properties will frequently go unoccupied for a couple days at a time.
Only one of those properties is under this post office, and at that property, if we fail to take mail out of the mailbox for even just a couple days, USPS declares the house vacant and stops delivering mail. We don't have this problem at any other property we own - anywhere in the whole United States - even when the people there don't check the mail for much longer periods. And it is a HUGE hassle to get this post office to start redelivering our mail once they declare it vacant.
When I tried to call this post office to complain, it took several phone calls over several days to even get connected to a supervisor - who promptly hung up on me. I have also tried using the online complaint form on the USPS website and I have gotten no response. The USPS website suggests writing in to the USPS Consumer Advocate Office, and I might try that next. But if anyone knows any better ways to complain to someone who can actually do something to fix this, please message me - I'd greatly appreciate it!