When I acquired my storage lot, I had never had to deal with a building manager. It took me a while to work out what they did and what the strata manager did.
Perhaps the new SM is in the same boat as me
Rather than hope things get better, convene a meeting with the SM, BM and committee and work out who does what.
There can be little or no overlap of the functions of the SM and BM depending on the contracts and how you want things run